[Issue 19983] Add fast path for std.internal.cstring.tempCString when copying an array without transcoding

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19983

--- Comment #2 from Nathan S. <n8sh.secondary at hotmail.com> ---
Array slice assignment operations are probably fast if the type defines them.
Should use them if possible for all input types, not just built-in arrays.

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