Uint8Array to/from Base64 to stage 4, per 2025.07.28 TC39

Author: ljharb

README.md

@@ -28,7 +28,6 @@ Stage 2 indicates that the committee expects these features to be developed and
 | [Decorator Metadata][decorator-metadata] | Kristen Hewell Garrett | Kristen Hewell Garrett | <sub>[decorator-metadata][decorator-metadata-tests]</sub> | <sub>[May&nbsp;2023][decorator-metadata-notes]</sub> |
 | [Source Phase Imports][source-phase-imports] | Luca Casonato | Guy Bedford<br />Luca Casonato | <sub>[source-phase-imports][source-phase-imports-tests]</sub> | <sub>[July&nbsp;2023][source-phase-imports-notes]</sub> |
 | [Time Zone Canonicalization][time-zone-canon] | Justin Grant | Justin Grant<br />Richard Gibson | <sub>[Temporal.TimeZone][time-zone-canon-tests] | <sub>[July&nbsp;2023][time-zone-canon-notes]</sub> |
-| [Uint8Array to/from Base64][uint8array-base64] | Kevin Gibbons | Kevin Gibbons | <sub>[uint8array-base64][uint8array-base64-tests]</sub> | <sub>[February&nbsp;2024][uint8array-base64-notes]</sub> |
 | [Dynamic Code Brand Checks][dynamic-code-brand-checks] | Nicolò Ribaudo | Krzysztof Kotowicz<br />Mike Samuel<br />Nicolò Ribaudo | :question: | <sub>April&nbsp;2024</sub> |
 | [Redeclarable global `eval`-introduced `var`s][redeclarable-global-eval-vars] | Shu-yu Guo | Shu-yu Guo | <sub>[Testing plan][redeclarable-global-eval-vars-testplan]</sub> | <sub>[April&nbsp;2024][redeclarable-global-eval-vars-notes]</sub> |
 | [`Atomics.pause`][atomics-pause] | Shu-yu Guo | Shu-yu Guo | <sub>[Atomics.pause][atomics-pause-tests]</sub> | <sub>[October&nbsp;2024][atomics-pause-notes]</sub> |
@@ -174,9 +173,6 @@ Note that as part of the onboarding process your repository name may be normaliz
 [lazy-import]: https://github.com/tc39/proposal-defer-import-eval
 [lazy-import-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-02/february-18.md#import-defer-for-stage-3
 [lazy-import-testplan]: https://github.com/tc39/test262/issues/4111
-[uint8array-base64]: https://github.com/tc39/proposal-arraybuffer-base64
-[uint8array-base64-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-7.md#uint8array-base64-for-stages-27-and-3
-[uint8array-base64-tests]: https://github.com/tc39/test262/pull/3994
 [joint]: https://github.com/tc39/proposal-joint-iteration
 [joint-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-12.md#joint-iteration-for-stage-27
 [joint-testplan]: https://github.com/tc39/test262/issues/4112

finished-proposals.md

@@ -4,6 +4,7 @@ Finished proposals are proposals that have reached stage 4, and are included in
 
 | Proposal | Author | Champion(s) | TC39 meeting notes | Expected Publication Year |
 | ------------------------------------------------------------------------ | ------------------------------------------------------ | ------------------------------------------------------- | ------------------------------------------- | ------------------------- |
+| [Uint8Array to/from Base64][uint8array-base64] | Kevin Gibbons | Kevin Gibbons | July 2025 | 2026 |
 | [`Math.sumPrecise`][math-sum] | Kevin Gibbons | Kevin Gibbons | July 2025 | 2026 |
 | [`Error.isError`][is-error] | Jordan Harband | Jordan Harband | May 2025 | 2026 |
 | [`RegExp.escape`][escape] | Domenic Denicola<br />Benjamin Gruenbaum<br />Jordan Harband | Jordan Harband<br />Kevin Gibbons | [February 2025][escape-notes] | 2025 |
@@ -216,3 +217,5 @@ See also the [active proposals](README.md), [stage 1 proposals](stage-1-proposal
 [is-error-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-12/december-02.md#erroriserror-to-stage-3
 [math-sum]: https://github.com/tc39/proposal-math-sum
 [math-sum-notes]: https://github.com/tc39/notes/blob/main/meetings/2024-10/october-09.md#mathsumprecise-for-stage-3--last-chance-to-suggest-other-names
+[uint8array-base64]: https://github.com/tc39/proposal-arraybuffer-base64
+[uint8array-base64-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-7.md#uint8array-base64-for-stages-27-and-3