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Add a constant for the maximum codepoint

    As specified by unicode.

--- a/libstd/utf.myr

+++ b/libstd/utf.myr

@@ -4,7 +4,8 @@

 pkg std =

 	const Badchar	: char = -1 castto(char)

-	const Maxcharlen : size= 4

+	const Maxcharlen : size = 4

+	const Maxcharval : char = 0x10FFFF

 	const charlen	: (chr : char -> size)

 	const encode	: (buf : byte[:], chr : char -> size)