[12.x] clarify where(), whereNull(), and whereNotNull() usage #10814
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this change helps clarify usage of the `where()`, `whereNull()`, and `whereNotNull()` methods with a `null` value. discourage the use of `$collection->where('field', '!=', null)` because it will possibly cause unexpected results with "nully" values. show more values that are "nully" and how they will be treated with the strict check. 
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this change helps clarify usage of the
where(),whereNull(), andwhereNotNull()methods with anullvalue.discourage the use of
$collection->where('field', '!=', null)because it will possibly cause unexpected results with "nully" values.show more values that are "nully" and how they will be treated with the strict check.