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Return true/false from chomp.

--- a/lib/std/chomp.myr

+++ b/lib/std/chomp.myr

@@ -1,13 +1,14 @@

 use "hasprefix"

 pkg std =

-	const chomp	: (str : byte[:], pfx : byte[:] -> byte[:])

+	const chomp	: (str : byte[:]#, pfx : byte[:] -> bool)

 ;;

 const chomp = {str, pfx

-	if std.hasprefix(str, pfx)

-		-> str[pfx.len:]

+	if std.hasprefix(str#, pfx)

+		str# = str#[pfx.len:]

+		-> true

 	else

-		-> str

+		-> false

 	;;

 }