Can't write WOMANS HAT emoji with \uXXXX unicode escapes

Unicode includes a bunch of 5+ hex digit characters now; most notably emoji, but I think there might be some real human language characters in there too.

Puppet's \u escape sequences don't accommodate these. The 5-digit versions get truncated, and the alternate 2x4-digit forms result in an error.

notice("5 digit unicode \u1f452 hat") # prints: 5 digit unicode ὅ2 hat

# notice("double 4 digit unicode \uD83D\uDC52 hat") # Results in Error: Could not parse for environment production: invalid byte sequence in UTF-8 on node magpie.lan

notice("literal 👒 hat") # works fine

Update

The implementation allows using the escape

\u{nnnn}

where n is 1 or more hex digits.

notice("5 digit unicode \u{1f452} hat")

QA Risk Analysis