Enhance handling of CP932 text encoding

- Don't allow control characters to appear in the middle of a multi-byte
character. (This was a strange feature of mbstring; it doesn't make muc

Enhance handling of CP932 text encoding

- Don't allow control characters to appear in the middle of a multi-byte
character. (This was a strange feature of mbstring; it doesn't make much
sense, and iconv doesn't allow it.)
- Treat truncated multi-byte characters as an error.

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