Fix Phobos dependencies on autodecoding

[sarn]

On Friday, 16 August 2019 at 16:32:05 UTC, xenon325 wrote:
> If same glyphs had same codes, what will you do with these:
> ...
> 2) Convert cases:
> - in english: 'B'.toLower == 'b'
> - in russian: 'В'.toLower == 'в'

FWIW, we have that problem today with Unicode and the letter i:
https://en.wikipedia.org/wiki/Dotted_and_dotless_I#In_computing