v0.3.0

Added

• Performance tunables: Cton.dump now accepts decimal_mode: :fast | :precise, allowing callers to trade float-format determinism for lower allocation pressure. Specs cover both modes.
• Benchmark harness: New bench/encode_decode_bench.rb script (wired into the README/Development docs) exercises encode/decode hot paths and prints comparative JSON vs CTON timings. On Ruby 3.1.4/macOS the fast encoder completes 1,000 iterations in ~0.63s and the new inline decoder stress test wraps 400 concatenated documents in ~4.14s.
• Regression tests: Added specs for streaming documents without separators plus validation around the new decimal mode toggle.

Changed

• Encoder: Memoizes table schemas per array instance, adds a fast-path for homogeneous scalar lists, and reduces float/BigDecimal copying by favoring Ruby's native float formatting before falling back to BigDecimal. Unsupported decimal_mode values now raise immediately.
• Decoder: Replaces high-allocation StringScanner tokenization with raw string slicing, improves key-boundary detection for inline payloads, and keeps symbolization logic untouched. Boundary heuristics now prefer alphabetic key starts to avoid splitting numeric payloads.
• Documentation: README now calls out the tuning flags, inline caveats, and benchmark instructions; Development workflow highlights how to rerun the perf suite.

Fixed

• Inline parsing: Eliminated the runaway allocations and incorrect key splits when processing long documents with separator: "".
• Float normalization: Restored canonical 9.2-style output in fast mode while keeping the new perf optimizations.