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Merged
MichalStrehovsky merged 10 commits into from
Jan 30, 2025
Merged

Replace OPTIMIZE_FOR_SIZE with feature switch #111743

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5412071
Temp change to force enable
MichalStrehovsky Jan 23, 2025
eb3fe5c
Build a single System.Linq assembly
MichalStrehovsky Jan 24, 2025
4f9fad1
More temp compiler code
MichalStrehovsky Jan 24, 2025
4636aba
Fix PlatformDetection
MichalStrehovsky Jan 24, 2025
e31d983
Adjust tests
MichalStrehovsky Jan 27, 2025
b869eea
Revert "More temp compiler code"
MichalStrehovsky Jan 28, 2025
0c8ae74
Revert "Temp change to force enable"
MichalStrehovsky Jan 28, 2025
77f2636
FB
MichalStrehovsky Jan 28, 2025
60297de
Set default for WASM
MichalStrehovsky Jan 28, 2025
da36781
Rename IsLinqSizeOptimized method to ComputeIsLinqSizeOptimized
MichalStrehovsky Jan 29, 2025
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13 changes: 11 additions & 2 deletions src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -142,8 +142,17 @@ public static int SlowRuntimeTimeoutModifier

public static bool IsStartingProcessesSupported => !IsiOS && !IstvOS;

public static bool IsSpeedOptimized => !IsSizeOptimized;
public static bool IsSizeOptimized => IsBrowser || IsWasi || IsAndroid || IsAppleMobile;
public static bool IsLinqSpeedOptimized => !IsLinqSizeOptimized;
public static bool IsLinqSizeOptimized => s_linqIsSizeOptimized.Value;
private static readonly Lazy<bool> s_linqIsSizeOptimized = new Lazy<bool>(ComputeIsLinqSizeOptimized);
private static bool ComputeIsLinqSizeOptimized()
{
#if NET
return (bool)typeof(Enumerable).GetMethod("get_IsSizeOptimized", BindingFlags.NonPublic | BindingFlags.Static).Invoke(null, Array.Empty<object>());
#else
return false;
#endif
}

public static bool IsBrowserDomSupported => IsEnvironmentVariableTrue("IsBrowserDomSupported");
public static bool IsBrowserDomSupportedOrNotBrowser => IsNotBrowser || IsBrowserDomSupported;
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4 changes: 2 additions & 2 deletions src/libraries/System.IO.Compression/tests/ZipArchive/zip_LargeFiles.cs
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Expand Up @@ -9,7 +9,7 @@ namespace System.IO.Compression.Tests;
[Collection(nameof(DisableParallelization))]
public class zip_LargeFiles : ZipFileTestBase
{
[ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsSpeedOptimized), nameof(PlatformDetection.Is64BitProcess))] // don't run it on slower runtimes
[ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotMobile), nameof(PlatformDetection.Is64BitProcess))] // don't run it on slower runtimes
[OuterLoop("It requires almost 12 GB of free disk space")]
public static void UnzipOver4GBZipFile()
{
Expand Down Expand Up @@ -49,7 +49,7 @@ private static void FillWithHardToCompressData(byte[] buffer)
Random.Shared.NextBytes(buffer);
}

[ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsSpeedOptimized), nameof(PlatformDetection.Is64BitProcess))] // don't run it on slower runtimes
[ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsNotMobile), nameof(PlatformDetection.Is64BitProcess))] // don't run it on slower runtimes
[OuterLoop("It requires 5~6 GB of free disk space and a lot of CPU time for compressed tests")]
[InlineData(false)]
[InlineData(true)]
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2 changes: 1 addition & 1 deletion src/libraries/System.IO.Packaging/tests/LargeFilesTests.Net.cs
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Expand Up @@ -15,7 +15,7 @@ private static void FillWithHardToCompressData(byte[] buffer)
Random.Shared.NextBytes(buffer);
}

[ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsSpeedOptimized), nameof(PlatformDetection.Is64BitProcess))] // don't run it on slower runtimes
[ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsNotMobile), nameof(PlatformDetection.Is64BitProcess))] // don't run it on slower runtimes
[InlineData(false)]
[InlineData(true)]
[OuterLoop("It requires 5~6 GB of free disk space and a lot of CPU time for compressed tests")]
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59 changes: 23 additions & 36 deletions src/libraries/System.Linq/src/System.Linq.csproj
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@@ -1,98 +1,85 @@
<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppCurrent)-browser;$(NetCoreAppCurrent)-wasi;$(NetCoreAppCurrent)-android;$(NetCoreAppCurrent)-ios;$(NetCoreAppCurrent)-tvos</TargetFrameworks>
<TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
<UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
</PropertyGroup>

<!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
<PropertyGroup>
<TargetPlatformIdentifier>$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)'))</TargetPlatformIdentifier>
<OptimizeForSize Condition="'$(TargetPlatformIdentifier)' == 'browser' or '$(TargetPlatformIdentifier)' == 'android' or '$(TargetPlatformIdentifier)' == 'ios' or '$(TargetPlatformIdentifier)' == 'tvos'">true</OptimizeForSize>
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@pavelsavara pavelsavara Jan 29, 2025 •
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OptimizeForSize was set true for some targets but it's not anymore.
WasmFeatures.props set the default for wasm workload, but default runtime pack also needs to be optimized for size - when people don't use workload in Blazor.
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@MichalStrehovsky MichalStrehovsky Jan 29, 2025

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OptimizeForSize was set true for some targets but it's not anymore.

Yes, that is the purpose of this PR. To only have one build of this library (#111743 (comment))

WasmFeatures.props set the default for wasm workload, but default runtime pack also needs to be optimized for size - when people don't use workload in Blazor.

Could you please point me to which .targets we need to update? Is it the Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets linked from #111743 (comment)?
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@MichalStrehovsky MichalStrehovsky Jan 29, 2025

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(To be clear, the OptimizeForSize property controls whether we build System.Linq assembly in a not-fully-compatible manner (see the tests I'm touching where it behaves differently) that has better size characteristics. This PR deletes that build and changes it to always build the compatible Linq implementation. It introduces a feature switch that allows switching to the not-fully-compatible mode. The default for the feature switch is disabled. It can be enabled where the tradeoff is worth it (I have PRs out enabling it in places, linked above). The advantage is that now if a customer runs into the incompatibility, they can just set a property and unblock themselves.)
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@pavelsavara pavelsavara Jan 29, 2025

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I think maybe we need both

https://github.com/dotnet/sdk/blob/b89ea044c3ac0e028228e73abcc8310b101b63b8/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets#L43-L50

@maraf
I hope that we run ILLink during publish when wasm-workload is not installed ?
Is there better place ?

and for workload

https://github.com/dotnet/runtime/blob/f1901a00dfcfbcf0a4f8b6aa7459fec30846d1ab/src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.Current.Manifest/WasmFeatures.props
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@MichalStrehovsky MichalStrehovsky Jan 29, 2025

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Thank you! Folded the BlazorWebAssembly.targets change into dotnet/sdk#46375.

WasmFeatures.props change is already part of the PR here.
<DefineConstants Condition="'$(OptimizeForSize)' == 'true'">$(DefineConstants);OPTIMIZE_FOR_SIZE</DefineConstants>
</PropertyGroup>

<ItemGroup Condition="'$(OptimizeForSize)' == true">
<Compile Include="System\Linq\Skip.SizeOpt.cs" />
<Compile Include="System\Linq\Take.SizeOpt.cs" />
</ItemGroup>

<ItemGroup Condition="'$(OptimizeForSize)' != true">
<Compile Include="System\Linq\AppendPrepend.SpeedOpt.cs" />
<Compile Include="System\Linq\Cast.SpeedOpt.cs" />
<Compile Include="System\Linq\Concat.SpeedOpt.cs" />
<Compile Include="System\Linq\DefaultIfEmpty.SpeedOpt.cs" />
<Compile Include="System\Linq\Distinct.SpeedOpt.cs" />
<Compile Include="System\Linq\Grouping.SpeedOpt.cs" />
<Compile Include="System\Linq\Iterator.SpeedOpt.cs" />
<Compile Include="System\Linq\Lookup.SpeedOpt.cs" />
<Compile Include="System\Linq\OfType.SpeedOpt.cs" />
<Compile Include="System\Linq\OrderedEnumerable.SpeedOpt.cs" />
<Compile Include="System\Linq\Range.SpeedOpt.cs" />
<Compile Include="System\Linq\Repeat.SpeedOpt.cs" />
<Compile Include="System\Linq\Reverse.SpeedOpt.cs" />
<Compile Include="System\Linq\Select.SpeedOpt.cs" />
<Compile Include="System\Linq\SelectMany.SpeedOpt.cs" />
<Compile Include="System\Linq\Skip.SpeedOpt.cs" />
<Compile Include="System\Linq\SkipTake.SpeedOpt.cs" />
<Compile Include="System\Linq\Take.SpeedOpt.cs" />
<Compile Include="System\Linq\Union.SpeedOpt.cs" />
<Compile Include="System\Linq\Where.SpeedOpt.cs" />
</ItemGroup>

<ItemGroup>
<Compile Include="System\Linq\Aggregate.cs" />
<Compile Include="System\Linq\AnyAll.cs" />
<Compile Include="System\Linq\AppendPrepend.cs" />
<Compile Include="System\Linq\AppendPrepend.SpeedOpt.cs" />
<Compile Include="System\Linq\Average.cs" />
<Compile Include="System\Linq\Cast.cs" />
<Compile Include="System\Linq\Cast.SpeedOpt.cs" />
<Compile Include="System\Linq\Chunk.cs" />
<Compile Include="System\Linq\Concat.cs" />
<Compile Include="System\Linq\Concat.SpeedOpt.cs" />
<Compile Include="System\Linq\Contains.cs" />
<Compile Include="System\Linq\AggregateBy.cs" />
<Compile Include="System\Linq\CountBy.cs" />
<Compile Include="System\Linq\Count.cs" />
<Compile Include="System\Linq\DebugView.cs" />
<Compile Include="System\Linq\DefaultIfEmpty.cs" />
<Compile Include="System\Linq\DefaultIfEmpty.SpeedOpt.cs" />
<Compile Include="System\Linq\Distinct.cs" />
<Compile Include="System\Linq\Distinct.SpeedOpt.cs" />
<Compile Include="System\Linq\ElementAt.cs" />
<Compile Include="System\Linq\Enumerable.cs" />
<Compile Include="System\Linq\Except.cs" />
<Compile Include="System\Linq\First.cs" />
<Compile Include="System\Linq\Grouping.cs" />
<Compile Include="System\Linq\Grouping.SpeedOpt.cs" />
<Compile Include="System\Linq\GroupJoin.cs" />
<Compile Include="System\Linq\Index.cs" />
<Compile Include="System\Linq\Intersect.cs" />
<Compile Include="System\Linq\Iterator.cs" />
<Compile Include="System\Linq\Iterator.SpeedOpt.cs" />
<Compile Include="System\Linq\Join.cs" />
<Compile Include="System\Linq\Last.cs" />
<Compile Include="System\Linq\LeftJoin.cs" />
<Compile Include="System\Linq\Lookup.cs" />
<Compile Include="System\Linq\Lookup.SpeedOpt.cs" />
<Compile Include="System\Linq\Max.cs" />
<Compile Include="System\Linq\MaxMin.cs" />
<Compile Include="System\Linq\Min.cs" />
<Compile Include="System\Linq\OfType.cs" />
<Compile Include="System\Linq\OfType.SpeedOpt.cs" />
<Compile Include="System\Linq\OrderBy.cs" />
<Compile Include="System\Linq\OrderedEnumerable.cs" />
<Compile Include="System\Linq\OrderedEnumerable.SpeedOpt.cs" />
<Compile Include="System\Linq\PartialArrayEnumerator.cs" />
<Compile Include="System\Linq\Range.cs" />
<Compile Include="System\Linq\Range.SpeedOpt.cs" />
<Compile Include="System\Linq\Repeat.cs" />
<Compile Include="System\Linq\Repeat.SpeedOpt.cs" />
<Compile Include="System\Linq\Reverse.cs" />
<Compile Include="System\Linq\Reverse.SpeedOpt.cs" />
<Compile Include="System\Linq\RightJoin.cs" />
<Compile Include="System\Linq\SegmentedArrayBuilder.cs" />
<Compile Include="System\Linq\Select.cs" />
<Compile Include="System\Linq\Select.SpeedOpt.cs" />
<Compile Include="System\Linq\SelectMany.cs" />
<Compile Include="System\Linq\SelectMany.SpeedOpt.cs" />
<Compile Include="System\Linq\SequenceEqual.cs" />
<Compile Include="System\Linq\Single.cs" />
<Compile Include="System\Linq\SingleLinkedNode.cs" />
<Compile Include="System\Linq\Skip.cs" />
<Compile Include="System\Linq\Skip.SizeOpt.cs" />
<Compile Include="System\Linq\Skip.SpeedOpt.cs" />
<Compile Include="System\Linq\SkipTake.SpeedOpt.cs" />
<Compile Include="System\Linq\Sum.cs" />
<Compile Include="System\Linq\Take.cs" />
<Compile Include="System\Linq\Take.SizeOpt.cs" />
<Compile Include="System\Linq\Take.SpeedOpt.cs" />
<Compile Include="System\Linq\ThrowHelper.cs" />
<Compile Include="System\Linq\ToCollection.cs" />
<Compile Include="System\Linq\Union.cs" />
<Compile Include="System\Linq\Union.SpeedOpt.cs" />
<Compile Include="System\Linq\Utilities.cs" />
<Compile Include="System\Linq\Where.cs" />
<Compile Include="System\Linq\Where.SpeedOpt.cs" />
<Compile Include="System\Linq\Zip.cs" />
</ItemGroup>

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4 changes: 1 addition & 3 deletions src/libraries/System.Linq/src/System/Linq/AnyAll.cs
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Expand Up @@ -20,8 +20,7 @@ public static bool Any<TSource>(this IEnumerable<TSource> source)
return gc.Count != 0;
}

#if !OPTIMIZE_FOR_SIZE
if (source is Iterator<TSource> iterator)
if (!IsSizeOptimized && source is Iterator<TSource> iterator)
{
int count = iterator.GetCount(onlyIfCheap: true);
if (count >= 0)
Expand All @@ -32,7 +31,6 @@ public static bool Any<TSource>(this IEnumerable<TSource> source)
iterator.TryGetFirst(out bool found);
return found;
}
#endif

if (source is ICollection ngc)
{
Expand Down
8 changes: 2 additions & 6 deletions src/libraries/System.Linq/src/System/Linq/Count.cs
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Expand Up @@ -20,12 +20,10 @@ public static int Count<TSource>(this IEnumerable<TSource> source)
return collectionoft.Count;
}

#if !OPTIMIZE_FOR_SIZE
if (source is Iterator<TSource> iterator)
if (!IsSizeOptimized && source is Iterator<TSource> iterator)
{
return iterator.GetCount(onlyIfCheap: false);
}
#endif

if (source is ICollection collection)
{
Expand Down Expand Up @@ -115,8 +113,7 @@ public static bool TryGetNonEnumeratedCount<TSource>(this IEnumerable<TSource> s
return true;
}

#if !OPTIMIZE_FOR_SIZE
if (source is Iterator<TSource> iterator)
if (!IsSizeOptimized && source is Iterator<TSource> iterator)
{
int c = iterator.GetCount(onlyIfCheap: true);
if (c >= 0)
Expand All @@ -125,7 +122,6 @@ public static bool TryGetNonEnumeratedCount<TSource>(this IEnumerable<TSource> s
return true;
}
}
#endif

if (source is ICollection collection)
{
Expand Down
8 changes: 2 additions & 6 deletions src/libraries/System.Linq/src/System/Linq/ElementAt.cs
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Expand Up @@ -23,9 +23,7 @@ public static TSource ElementAt<TSource>(this IEnumerable<TSource> source, int i

bool found;
TSource? element =
#if !OPTIMIZE_FOR_SIZE
source is Iterator<TSource> iterator ? iterator.TryGetElementAt(index, out found) :
#endif
!IsSizeOptimized && source is Iterator<TSource> iterator ? iterator.TryGetElementAt(index, out found) :
TryGetElementAtNonIterator(source, index, out found);

if (!found)
Expand Down Expand Up @@ -123,9 +121,7 @@ public static TSource ElementAt<TSource>(this IEnumerable<TSource> source, Index
}

return
#if !OPTIMIZE_FOR_SIZE
source is Iterator<TSource> iterator ? iterator.TryGetElementAt(index, out found) :
#endif
!IsSizeOptimized && source is Iterator<TSource> iterator ? iterator.TryGetElementAt(index, out found) :
TryGetElementAtNonIterator(source, index, out found);
}

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4 changes: 4 additions & 0 deletions src/libraries/System.Linq/src/System/Linq/Enumerable.cs
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Expand Up @@ -2,13 +2,17 @@
// The .NET Foundation licenses this file to you under the MIT license.

using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace System.Linq
{
public static partial class Enumerable
{
[FeatureSwitchDefinition("System.Linq.Enumerable.IsSizeOptimized")]
internal static bool IsSizeOptimized { get; } = AppContext.TryGetSwitch("System.Linq.Enumerable.IsSizeOptimized", out bool isEnabled) ? isEnabled : false;

public static IEnumerable<TSource> AsEnumerable<TSource>(this IEnumerable<TSource> source) => source;

/// <summary>Returns an empty <see cref="IEnumerable{TResult}"/>.</summary>
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4 changes: 1 addition & 3 deletions src/libraries/System.Linq/src/System/Linq/First.cs
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Expand Up @@ -70,9 +70,7 @@ public static TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source,
}

return
#if !OPTIMIZE_FOR_SIZE
source is Iterator<TSource> iterator ? iterator.TryGetFirst(out found) :
#endif
!IsSizeOptimized && source is Iterator<TSource> iterator ? iterator.TryGetFirst(out found) :
TryGetFirstNonIterator(source, out found);
}

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8 changes: 3 additions & 5 deletions src/libraries/System.Linq/src/System/Linq/Iterator.cs
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Expand Up @@ -88,11 +88,9 @@ public Iterator<TSource> GetEnumerator()
/// <typeparam name="TResult">The type of the mapped items.</typeparam>
/// <param name="selector">The selector used to map each item.</param>
public virtual IEnumerable<TResult> Select<TResult>(Func<TSource, TResult> selector) =>
#if OPTIMIZE_FOR_SIZE
new IEnumerableSelectIterator<TSource, TResult>(this, selector);
#else
new IteratorSelectIterator<TSource, TResult>(this, selector);
#endif
!IsSizeOptimized
? new IteratorSelectIterator<TSource, TResult>(this, selector)
: new IEnumerableSelectIterator<TSource, TResult>(this, selector);


/// <summary>
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4 changes: 1 addition & 3 deletions src/libraries/System.Linq/src/System/Linq/Last.cs
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Expand Up @@ -69,9 +69,7 @@ public static TSource LastOrDefault<TSource>(this IEnumerable<TSource> source, F
}

return
#if !OPTIMIZE_FOR_SIZE
source is Iterator<TSource> iterator ? iterator.TryGetLast(out found) :
#endif
!IsSizeOptimized && source is Iterator<TSource> iterator ? iterator.TryGetLast(out found) :
TryGetLastNonIterator(source, out found);
}

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2 changes: 1 addition & 1 deletion src/libraries/System.Linq/src/System/Linq/Skip.SizeOpt.cs
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Expand Up @@ -7,7 +7,7 @@ namespace System.Linq
{
public static partial class Enumerable
{
private static IEnumerable<TSource> SkipIterator<TSource>(IEnumerable<TSource> source, int count)
private static IEnumerable<TSource> SizeOptimizedSkipIterator<TSource>(IEnumerable<TSource> source, int count)
{
using IEnumerator<TSource> e = source.GetEnumerator();
while (count > 0 && e.MoveNext()) count--;
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2 changes: 1 addition & 1 deletion src/libraries/System.Linq/src/System/Linq/Skip.SpeedOpt.cs
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Expand Up @@ -7,7 +7,7 @@ namespace System.Linq
{
public static partial class Enumerable
{
private static IEnumerable<TSource> SkipIterator<TSource>(IEnumerable<TSource> source, int count) =>
private static IEnumerable<TSource> SpeedOptimizedSkipIterator<TSource>(IEnumerable<TSource> source, int count) =>
source is IList<TSource> sourceList ?
(IEnumerable<TSource>)new IListSkipTakeIterator<TSource>(sourceList, count, int.MaxValue) :
new IEnumerableSkipTakeIterator<TSource>(source, count, -1);
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6 changes: 2 additions & 4 deletions src/libraries/System.Linq/src/System/Linq/Skip.cs
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Expand Up @@ -30,14 +30,12 @@ public static IEnumerable<TSource> Skip<TSource>(this IEnumerable<TSource> sourc

count = 0;
}
#if !OPTIMIZE_FOR_SIZE
else if (source is Iterator<TSource> iterator)
else if (!IsSizeOptimized && source is Iterator<TSource> iterator)
{
return iterator.Skip(count) ?? Empty<TSource>();
}
#endif

return SkipIterator(source, count);
return IsSizeOptimized ? SizeOptimizedSkipIterator(source, count) : SpeedOptimizedSkipIterator(source, count);
}

public static IEnumerable<TSource> SkipWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
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4 changes: 2 additions & 2 deletions src/libraries/System.Linq/src/System/Linq/Take.SizeOpt.cs
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Expand Up @@ -8,7 +8,7 @@ namespace System.Linq
{
public static partial class Enumerable
{
private static IEnumerable<TSource> TakeIterator<TSource>(IEnumerable<TSource> source, int count)
private static IEnumerable<TSource> SizeOptimizedTakeIterator<TSource>(IEnumerable<TSource> source, int count)
{
Debug.Assert(count > 0);

Expand All @@ -19,7 +19,7 @@ private static IEnumerable<TSource> TakeIterator<TSource>(IEnumerable<TSource> s
}
}

private static IEnumerable<TSource> TakeRangeIterator<TSource>(IEnumerable<TSource> source, int startIndex, int endIndex)
private static IEnumerable<TSource> SizeOptimizedTakeRangeIterator<TSource>(IEnumerable<TSource> source, int startIndex, int endIndex)
{
Debug.Assert(source is not null);
Debug.Assert(startIndex >= 0 && startIndex < endIndex);
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4 changes: 2 additions & 2 deletions src/libraries/System.Linq/src/System/Linq/Take.SpeedOpt.cs
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Expand Up @@ -8,7 +8,7 @@ namespace System.Linq
{
public static partial class Enumerable
{
private static IEnumerable<TSource> TakeIterator<TSource>(IEnumerable<TSource> source, int count)
private static IEnumerable<TSource> SpeedOptimizedTakeIterator<TSource>(IEnumerable<TSource> source, int count)
{
Debug.Assert(source is not null && !IsEmptyArray(source));
Debug.Assert(count > 0);
Expand All @@ -19,7 +19,7 @@ private static IEnumerable<TSource> TakeIterator<TSource>(IEnumerable<TSource> s
new IEnumerableSkipTakeIterator<TSource>(source, 0, count - 1);
}

private static IEnumerable<TSource> TakeRangeIterator<TSource>(IEnumerable<TSource> source, int startIndex, int endIndex)
private static IEnumerable<TSource> SpeedOptimizedTakeRangeIterator<TSource>(IEnumerable<TSource> source, int startIndex, int endIndex)
{
Debug.Assert(source is not null && !IsEmptyArray(source));
Debug.Assert(startIndex >= 0 && startIndex < endIndex);
Expand Down
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