Feature #565: Encoding::compatible? should also accept Encoding objects as parameters
http://redmine.ruby-lang.org/issues/show/565

Author: Michael Selig
Status: Open, Priority: Normal

Some software needs to do transcoding of strings or regexps to be compatible with incoming data from either a file or strings passed as parameters etc. It needs to say things like:

Encoding.compatible?(Encoding.default_external, str)
or:
Encoding.compatible?(io.internal_encoding, Encoding.find("ASCII"))
etc.

It is possible to do this by creating dummy strings in the encodings, and passing those, but in that case Ruby seems to try to optimize them based on content (eg: null strings), and so can say that the strings are compatible when in fact in general the encodings are not.
eg:
Encoding.compatible?("".force_encoding("UTF-16BE"), "".force_encoding("ASCII"))
=> #<Encoding:UTF-16BE>

So the request is to allow Encoding::compatible? to accept Encoding objects as well as strings and Regexps.


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