[copyleftdev]

JSON numbers currently pass through f64, losing precision, and numeric functions reject the decimal strings in #1. This adds an optional bigdecimal feature that enables serde_json/arbitrary_precision and preserves decimal values through numeric evaluation. Default behavior remains unchanged.

The paid-order example now returns "300.55": 100.30 + 200.25 = 300.55 (the issue's expected "300.95" is an arithmetic typo).

• Add decimal arithmetic, numeric functions, comparisons, sorting, hashing, and serialization, including precise JSON input and expression literals.
• Accept decimal strings in numeric functions; string operands produce string results, while number-only inputs produce JSON numbers. $number explicitly converts strings to numbers.
• Add regression coverage for precision boundaries, rounding, mixed inputs, bindings, serialization, and invalid arguments.
• Add CI checks for both feature configurations and update both READMEs and installation documentation with a runnable example and a Git dependency for the unreleased feature.

Local validation passed: workspace tests with the feature disabled and enabled, Clippy with warnings denied in both configurations, formatting, documentation builds, and the README example's regression test.

The existing JSONata compatibility runner reports failures without failing its test command. Default mode reports 1,027 passing cases, 4 existing failures, and 549 skipped cases. Decimal mode reports 1,018 passing cases, 13 failures, and 549 skipped cases: the same 4 existing failures plus 9 expected differences from accepting numeric strings, supporting numbers outside the f64 range, and preserving string-conversion precision.

Documented limits: inexact operations follow BigDecimal's precision rules (normally 100 significant digits); $power supports integer and half-integer exponents and returns D3061 for other fractional exponents; $round uses half-even rounding with precision from -10,000 to 10,000. $random retains its existing behavior. Inputs already rounded through Rust floating-point literals cannot regain lost precision.

Refs #1.

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Reviewing files that changed from the base of the PR and between 46a0afc and 8bb32f5.

📒 Files selected for processing: 23

• .github/workflows/ci.yml
• CHANGELOG.md
• README.md
• crates/seuil/Cargo.toml
• crates/seuil/README.md
• crates/seuil/src/decimal.rs
• crates/seuil/src/evaluator/engine.rs
• crates/seuil/src/evaluator/functions/array.rs
• crates/seuil/src/evaluator/functions/mod.rs
• crates/seuil/src/evaluator/functions/numeric_decimal.rs
• crates/seuil/src/evaluator/functions/object.rs
• crates/seuil/src/evaluator/functions/type_ops.rs
• crates/seuil/src/evaluator/value/impls.rs
• crates/seuil/src/evaluator/value/mod.rs
• crates/seuil/src/evaluator/value/serialize.rs
• crates/seuil/src/lib.rs
• crates/seuil/src/parser/ast.rs
• crates/seuil/src/parser/pratt.rs
• crates/seuil/src/parser/process.rs
• crates/seuil/src/parser/tokenizer.rs
• crates/seuil/tests/bigdecimal.rs
• crates/seuil/tests/issue_1.rs
• docs/src/installation.md

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