ref: improve casting usage example

[ericnordelo]

Summary by CodeRabbit

• New Features

  • Introduced a new, more intuitive and streamlined syntax for numeric type conversions that significantly improves code readability and overall developer experience

• Documentation

  • Updated comprehensive usage examples and documentation to effectively showcase the new simplified approach to type conversion throughout the codebase

• Tests

  • Test suite updated to properly validate the new type conversion functionality across various scenarios and edge cases

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[coderabbitai]

Walkthrough

The changes update code examples and tests to use an extension-style method syntax for casting u128 to UD30x9. This replaces direct function calls with trait-based method calls, allowing the syntax u128_value.into_UD30x9() instead of casting_u128::into_UD30x9(u128_value).

Changes

Cohort / File(s)	Summary
README and Test Updates math/fixed_point/README.md, math/fixed_point/tests/ud30x9_tests.move	Updated examples and test cases to use extension-style casting syntax. Imports into_UD30x9 and applies trait-based method calls on u128 values. Call site changed from casting_u128::into_UD30x9(value) to value.into_UD30x9().

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• PR #129: Introduces the casting_u128::into_UD30x9 function and UD30x9 types that are being refactored here to use extension method syntax.

Suggested reviewers

• immrsd
• bidzyyys

Poem

🐰 A trait upon the u128 hops,
Where casting chains no longer stops,
Dot notation takes the lead,
.into_UD30x9() at speed,
Fixed-point math in cleaner style! 📊

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request lacks a description entirely. The repository template requires context for understanding the PR's purpose, issue reference, and a checklist for completeness.	Add a detailed description explaining the changes, reference the related issue number, and complete the PR checklist items (Tests, Documentation, Changelog).

✅ Passed checks (2 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately describes the main change: introducing an extension-style casting approach to improve the usage example in the codebase.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/improve-casting-example

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.56%. Comparing base (238d977) to head (be13839).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #131   +/-   ##
=======================================
  Coverage   96.56%   96.56%           
=======================================
  Files          18       18           
  Lines        1397     1397           
  Branches      360      360           
=======================================
  Hits         1349     1349           
  Misses         27       27           
  Partials       21       21           

Flag	Coverage Δ
contracts/access	53.50% <ø> (ø)
math/core	95.96% <ø> (ø)
math/fixed_point	59.17% <ø> (ø)

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[bidzyyys]

LGTM!