- The compiler charges each working list's added capacity before it
grows (capacity doubles), the code that joins alternatives, and the
flattened code with its stack, instead of an estimate from
instruction and fragment counts.
- The scan for capturing groups and the syntax check before compiling
each take one unit of fuel per unit of the pattern.
- Bytes a dropped HeldBytes released leave the heap's total at the
next limit check, not at the next collection.
- The progress line lists the deletable RegExp.prototype flag
properties among the test262 failures.