[Issue 12642] Avoid some heap allocation cases for fixed-size arrays

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12642

--- Comment #2 from bearophile_hugs at eml.cc ---
See also a comment:
http://forum.dlang.org/post/ixrdixakezvtilemiyut@forum.dlang.org

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