Phobos' std.conv.to-conversion from enum to string doesn't scale beyond hundreds of enumerators

[Per Nordlöw]

On Friday, 22 June 2018 at 20:56:58 UTC, Stefan Koch wrote:
>>> How will that perform in CTFE? I'm concerned about swapping 
>>> values making it allocate new arrays all over the place.

What about creating a bit-array with the size of the enumerator 
count and use that to detect duplicates? How well would a 
mutating bitarray play in CTFE?