[MERGE REVIEW] Binary file handling

[Aaron Bentley]

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Robert Collins wrote:

> There is a defined way to detect utf16 though - look for the byte
> ordering mark.

Sure.  But then we're definitely into the realm of filetype-specific
diff and merge operations, since UTF-16 files use 16-bit words, and so
we can't detect line endings properly without parsing them as UTF-16.
(Parsing them as  byte files produces false positives.)

Aaron
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