2025 08 30 format

[thedavidmeister]

Motivation

Solution

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• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
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Summary by CodeRabbit

• New Features

  • Formatting accepts a configurable significant‑figures limit and now emits scientific notation for very large/small magnitudes; sign, zero, integral and fractional display improved. Public formatting API updated to accept the sig‑figs parameter.

• Bug Fixes

  • Stricter precision‑loss detection when parsing, including additional overflow checks for extreme inputs.

• Tests

  • Expanded formatting/parsing tests, added sig‑figs unit and regression tests, and updated expected outputs for scientific notation.

• Documentation

  • Updated comments describing off‑chain, non‑gas‑sensitive formatting behavior.