fn isUnreserved(c: u8) bool
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
c: u8
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fn isUnreserved(c: u8) bool { return switch (c) { 'A'...'Z', 'a'...'z', '0'...'9', '-', '.', '_', '~' => true, else => false, }; }
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"