[Issue 20134] New: autodecode should use replacementDchar rather than throwing on invalid

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20134

          Issue ID: 20134
           Summary: autodecode should use replacementDchar rather than
                    throwing on invalid
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

Currently, when the autodecoder encounters an invalid UTF sequence, it throws a
UTFexception. In contrast, the byUTF conversions return a replacementDchar
instead, as does foreach() when decoding.

This enhancement would make the behavior consistent, with the additional
benefits of character processing being @nogc and nothrow and even pure.

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