[Issue 10717] New: std.ascii.toLower and toUpper should return char instead of dchar and avoid me to use a bad cast(char)

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10717

           Summary: std.ascii.toLower and toUpper should return char
                    instead of dchar and avoid me to use a bad cast(char)
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2013-07-26 05:06:14 PDT ---
If I use functions from std.ascii I am stating that I am working with ASCII
chars.

Also std.ascii docs say: "All of the functions in std.ascii accept unicode
characters but effectively ignore them."

So if I use std.ascii.toLower on an ASCII char, in most times (all times so
far) I want the result to be a char. If std.ascii.toLower returns a dchar it
forces me to use a cast(char) in most (or all) cases. Such cast doesn't
increase safety at all, it actually decreases it.

So I'd like std.ascii.toLower and std.ascii.toUpper to return char.

(This has a severity 'normal' instead of 'enhancement' because I regard that as
a bug in the design of those two functions.)

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