Do not colorize output destined for configured logger #664
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This changes the predicate supplied to the #colorize method to ensure
that if a logger is set, the colorizing ANSI escape codes are not applied.
This definitely appears to have been the intention behind the original
implementation, but the tests didn't reflect how .log_internal was
actually called. In reality, it is always supplied with an
out:
argument, not nil. This caused all logger bound output to also be
colorized.