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82180d040b
restore correct argument passing for Regexp.compile when encoding is
present but flags are not. regexp literals like /a/n should compile to
Regexp.compile("a", nil, "n") with 3 arguments, not
Regexp.compile("a", "n") with 2 arguments.
the bug was introduced during refactoring when the nil-insertion logic
for the options parameter was accidentally omitted. now properly inserts
OP_LOADNIL when flags are absent but encoding is present.
Co-authored-by: Claude <noreply@anthropic.com>