qvalue = "\n\r\t\\\"\'\`\,\x5c\u{263a}\u{0263a}\u{00263A}\u{10FFFF}`'"
bvalue = `\n\r\t\\\"\'\`\,\x5c\u{263a}\u{0263a}\u{00263A}\u{10FFFF}"'`
nvalue = \n\r\t\u\x\,
unquoted_escape = \`foo\`