sgerrand / ex_req_server_sent_events / 26573765012

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perf(frame): split on multi-pattern delimiters without normalising

split/1 previously rewrote the entire accumulated buffer on every
chunk via String.replace("\r\n", "\n") so it could match a single
"\n\n" delimiter. For a large multi-chunk frame this was O(N²) in
buffer size.

Switch to :binary.split on the set ["\n\n", "\r\n\r\n", "\r\r"]
directly, which removes the whole-buffer rewrite and additionally
recognises bare CR frame delimiters per SSE spec §9.2.4. Returned
frame strings now retain their original line endings; parse/1
already handles all three terminator forms.

2 of 2 new or added lines in 1 file covered. (100.0%)

88 of 88 relevant lines covered (100.0%)

21.1 hits per line