lone surrogates - split codepoint problem.sh

# see the replacement character ( Buffer.from(new TextEncoder().encode('\u{fffd}')) ) instead
# https://en.wikipedia.org/wiki/Specials_(Unicode_block)#Replacement_character
node -e 'process.stdout.write("👌"[0]);setTimeout(() => {process.stdout.end("👌"[1]); process.exit()},3e3)' |
  node -e '(async (s = "") => {for await (const a of process.stdin) {console.log(a); s+= a}; console.log(s)})()'