[Issue 17741] std.range.transposed does not work with Map

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17741

--- Comment #3 from Alexandru Razvan Caciulescu <alexandru.razvan.c at gmail.com> ---
https://github.com/dlang/phobos/pull/5810

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