[qodelicious]

GNU sed keeps only the low byte of a \d or \o value, so \d513 and \o401 are both 0x01 and \d321 is A. We turned the whole number into a char, so they came out as U+0201 and U+0101 (two bytes each in a UTF-8 locale).

$ echo a | ./target/debug/sed 's/./\d513/' | od -c
0000000 310 201  \n
$ echo a | /usr/bin/sed 's/./\d513/' | od -c    # GNU sed 4.9
0000000 001  \n

This is one of the cases in the GNU testsuite's convert-number.sh. parse_numeric_escape now masks the value to 8 bits for the byte escapes (\d, \o, \x). \u and \U are untouched. Since the regex, replacement and y strings all go through parse_char_escape, they all get it.

Added test_numeric_escape_keeps_the_low_byte and two unit tests in delimited_parser.rs. They fail on main and pass with the change, and the output matches GNU sed 4.9. cargo test, cargo fmt --check and cargo clippy --all-targets --all-features -- -D warnings pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.08%. Comparing base (786c87f) to head (a9a71df).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #641   +/-   ##
=======================================
  Coverage   95.07%   95.08%           
=======================================
  Files          14       14           
  Lines        7436     7451   +15     
  Branches      439      440    +1     
=======================================
+ Hits         7070     7085   +15     
  Misses        365      365           
  Partials        1        1           

Flag	Coverage Δ
macos_latest	96.58% <100.00%> (+<0.01%)	⬆️
ubuntu_latest	96.52% <100.00%> (+<0.01%)	⬆️
windows_latest	0.00% <0.00%> (ø)

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