Meta.parse(repr(Char(0x110000))) fails because

julia> show(Char(0x110000))
'\U110000'

but '\U110000' is not parseable:

julia> '\U110000'
ERROR: ParseError:
# Error @ REPL[17]:1:2
'\U110000'
#└──────┘ ── invalid unicode escape sequence

isvalid(Char(0x110000)) is false, but other invalid characters are parsed okay:

julia> '\ud800'
'\ud800': Unicode U+D800 (category Cs: Other, surrogate)

julia> isvalid('\ud800')
false

so this seems kind of inconsistent.

Options are either (a) change the printing of Char(0x110000) or (b) change the parsing to allow this. I lean towards (a). Thoughts?