primops: Introduce unsafeThawByteArray#
This addresses an odd asymmetry in the ByteArray# primops, which previously provided unsafeFreezeByteArray# but no corresponding thaw operation.
Closes #22710 (closed)
To do
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Add testcase
This addresses an odd asymmetry in the ByteArray# primops, which previously provided unsafeFreezeByteArray# but no corresponding thaw operation.
Closes #22710 (closed)