v0.3.0 - Fast Parallel Mode

Highlights

• 5x+ faster than C dealer.exe with parallel execution
• New xoshiro256++ RNG enables stateless deal generation
• --legacy flag preserves dealer.exe compatibility

New Features

• Fast parallel mode (default) with xoshiro256++ RNG
• --legacy flag for dealer.exe-compatible single-threaded mode
• deal-validator binary for validating deals against filters
• Chained comparison support (a == b == c)
• Positional input file argument
• -g and -p can now be used together

Performance

Implementation	Time	Speedup
C dealer.exe	16.1s	1.0x (baseline)
Rust legacy	14.0s	1.15x
Rust fast (12 threads)	3.1s	5.2x

• 3.9x speedup with 12 threads vs single-threaded
• FxHashMap and reference-based evaluation (9.6x eval speedup)

Bug Fixes

• Predeal parsing for suit-only holdings
• Parser compatibility with dlr test suite
• dealer.exe generate limit (10M) and average format (%g)

Usage

# Fast mode (default) - uses all CPU cores
dealer -p 1000 -s 42 filter.dlr

# Legacy mode - exact dealer.exe compatibility
dealer --legacy -p 1000 -s 42 filter.dlr

# Validate deals against filter
./dealer -p 100 -s 42 -f oneline filter.dlr | ./deal-validator filter.dlr

See CHANGELOG.md for full details.