fails:Regexp.escape works with symbols
fails:Regexp.escape sets the encoding of the result to US-ASCII if there are only US-ASCII characters present in the input String
fails:Regexp.escape sets the encoding of the result to the encoding of the String if any non-US-ASCII characters are present in an input String with valid encoding
fails:Regexp.escape sets the encoding of the result to ASCII-8BIT if any non-US-ASCII characters are present in an input String with invalid encoding
