[Issue 24644] New: write functions should handle invalid bool values specially

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24644

          Issue ID: 24644
           Summary: write functions should handle invalid bool values
                    specially
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: qs.il.paperinik at gmail.com

Functions of the family write(f)?(ln)? should handle invalid `bool` values
(i.e. ones whose bit pattern isn’t `0x00` or `0x01`) by printing `__bool(0x??)`
with `??` replaced by the hex value. For formatted write functions, that
applies to the `%s` format. Numeric formats such as `%d`, `%x`, etc., already
print the correct (bit-pattern) value.

This would make debugging invalid bool values a lot easier.

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