Wrong output to escaped character

[alexander-akait]

Input:

.class { content: "\F10C" }

Output:

.class { content: "\F10C" }

Seems works fine.

But wrong with lowercase.
Input:

.class { content: "\f10C" }

Output:

.class { content: "\F10C" }

I do not think it's true to change case of escaped character.

[mathiasbynens]

Case in escape sequences doesn’t matter. \f10C and \F10C decode to the exact same string.

[alexander-akait]

@mathiasbynens yep, but it's still not quite right, some postcss plugins in theory can handle \F and \f difference.

[alexander-akait]

@mathiasbynens if we have postcss-change-case-escaped-characters (or something like this) then it would be appropriate, any stringer should not change anything if it was not made specifically for the change, this repository is definitely not responsible for this and should not do so

[mathiasbynens]

some postcss plugins in theory can handle \F and \f difference.

CSS doesn’t handle them differently, so why should those plugins?

[alexander-akait]

@mathiasbynens I'm not saying that this is a critical error, but this is exactly the unpredictable behavior that in theory, as I said earlier, could lead to errors in places where in general it was not expected, also it breaks the tests when i passed with lowercase i expected in lowercase

[mathiasbynens]

The only bug I see is that somehow (already-escaped) CSS strings are being escaped again.

[alexander-akait]

@markdalgleish can you help our with PR?