2025 10 01 readme

[thedavidmeister]

Motivation

Solution

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

Summary by CodeRabbit

• Documentation
  • Rewrote and reformatted README for Rain floats; improved structure and readability.
  • Greatly expanded explanations of value mapping, canonical representations, rounding directions, and precision preservation.
  • Detailed exponent (underflow/overflow) behavior, packing semantics, and fixed-decimal conversions.
  • Added extensive guidance on parsing/formatting, approximations, and error handling (uncomputable values, no infinities, lossless vs. lossy modes).

[coderabbitai]

Walkthrough

README.md was reformatted and substantially expanded with detailed documentation for Rain floats covering representation, exact-value mapping, rounding, precision preservation, exponent behavior, packing semantics, fixed-decimal conversions, error handling (no infinities), uncalculable values, parsing/formatting, lossless vs lossy modes, and approximation behavior. No code or API changes.

Changes

Cohort / File(s)

Summary of Changes

Docs README.md

Reflowed text and substantially expanded documentation describing Rain float representation, exact-value mappings, rounding strategy, precision preservation, exponent underflow/overflow behavior, packing semantics, fixed-decimal conversions, error handling without infinities, uncalculable values, parsing/formatting, lossless vs lossy modes, and approximation behavior. Documentation-only; no code or API changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Update README.md #102 — Documentation-only README update expanding descriptions of the Rain decimal-float representation and behavior; closely related in subject and scope.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title Check	⚠️ Warning	The title “2025 10 01 readme” is essentially a date stamp plus the file name and does not convey the substantive updates made to the README, such as the expanded sections on rounding behavior, precision preservation, exponent handling, and error semantics, making it too generic and uninformative for someone scanning the change history.	Please rename the pull request to a concise sentence that highlights the core change—for example, “Expand README with detailed rounding, precision, and error handling documentation”—so that reviewers immediately understand the intent and scope of the update.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 2025-10-01-readme

---

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 6b7a761 and 4524c86.

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🧠 Learnings (3)

📓 Common learnings

Learnt from: 0xgleb
PR: rainlanguage/rain.math.float#59
File: crates/float/src/lib.rs:233-242
Timestamp: 2025-06-17T10:17:56.205Z
Learning: In the rainlanguage/rain.math.float repository, the maintainer 0xgleb prefers to handle documentation additions and improvements in separate issues rather than inline with feature PRs.

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#110
File: src/lib/implementation/LibDecimalFloatImplementation.sol:1011-1011
Timestamp: 2025-08-26T15:50:31.262Z
Learning: In the rain.math.float repository, thedavidmeister prefers concise, high-level documentation comments that capture intent rather than detailed comments that mirror implementation specifics. Detailed implementation-focused comments are considered fragile because they become outdated when code changes but comments aren't updated.

📚 Learning: 2025-09-28T13:28:35.814Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#144
File: test/src/lib/LibDecimalFloat.pow.t.sol:40-61
Timestamp: 2025-09-28T13:28:35.814Z
Learning: In test/src/lib/LibDecimalFloat.pow.t.sol, the diffLimit tolerance (currently 8.6%) represents a conservative worst-case bound to accommodate precision limitations of table lookup interpolation for fractional exponents in the pow function. The exponentiation-by-squaring approach used for integer parts achieves much tighter precision, but the tolerance must account for the less precise table-based calculations used for fractional exponents.

Applied to files:

• README.md

📚 Learning: 2025-09-09T15:11:31.003Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#130
File: src/lib/implementation/LibDecimalFloatImplementation.sol:320-330
Timestamp: 2025-09-09T15:11:31.003Z
Learning: In LibDecimalFloatImplementation.sol div function, returning zero when underflowExponentBy > 76 is intentional "non-error underflow" behavior rather than reverting. This graceful handling is the main goal of the changes.

Applied to files:

• README.md

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (9)

• GitHub Check: rainix (ubuntu-latest, test-wasm-build)
• GitHub Check: rainix (ubuntu-latest, rainix-rs-static)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-test)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-static)
• GitHub Check: rainix (macos-latest, rainix-rs-test)
• GitHub Check: rainix (macos-latest, rainix-sol-legal)
• GitHub Check: rainix (ubuntu-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-legal)
• GitHub Check: git-clean

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[coderabbitai]

Actionable comments posted: 5

📜 Review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ad27a89 and 0b2e942.

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🧠 Learnings (2)

📓 Common learnings

Learnt from: 0xgleb
PR: rainlanguage/rain.math.float#59
File: crates/float/src/lib.rs:233-242
Timestamp: 2025-06-17T10:17:56.205Z
Learning: In the rainlanguage/rain.math.float repository, the maintainer 0xgleb prefers to handle documentation additions and improvements in separate issues rather than inline with feature PRs.

📚 Learning: 2025-09-28T13:28:35.814Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#144
File: test/src/lib/LibDecimalFloat.pow.t.sol:40-61
Timestamp: 2025-09-28T13:28:35.814Z
Learning: In test/src/lib/LibDecimalFloat.pow.t.sol, the diffLimit tolerance (currently 8.6%) represents a conservative worst-case bound to accommodate precision limitations of table lookup interpolation for fractional exponents in the pow function. The exponentiation-by-squaring approach used for integer parts achieves much tighter precision, but the tolerance must account for the less precise table-based calculations used for fractional exponents.

Applied to files:

• README.md

🪛 markdownlint-cli2 (0.18.1)

README.md

41-41: Unordered list indentation
Expected: 2; Actual: 4

(MD007, ul-indent)

---

63-63: Bare URL used

(MD034, no-bare-urls)

---

189-189: Bare URL used

(MD034, no-bare-urls)

---

225-225: Files should end with a single newline character

(MD047, single-trailing-newline)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (9)

• GitHub Check: rainix (ubuntu-latest, test-wasm-build)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-static)
• GitHub Check: rainix (macos-latest, rainix-sol-legal)
• GitHub Check: rainix (ubuntu-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, rainix-rs-static)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-test)
• GitHub Check: rainix (macos-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-legal)
• GitHub Check: git-clean

[coderabbitai]

Actionable comments posted: 3

📜 Review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0b2e942 and ac2e004.

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🧠 Learnings (3)

📓 Common learnings

Learnt from: 0xgleb
PR: rainlanguage/rain.math.float#59
File: crates/float/src/lib.rs:233-242
Timestamp: 2025-06-17T10:17:56.205Z
Learning: In the rainlanguage/rain.math.float repository, the maintainer 0xgleb prefers to handle documentation additions and improvements in separate issues rather than inline with feature PRs.

📚 Learning: 2025-09-28T13:28:35.814Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#144
File: test/src/lib/LibDecimalFloat.pow.t.sol:40-61
Timestamp: 2025-09-28T13:28:35.814Z
Learning: In test/src/lib/LibDecimalFloat.pow.t.sol, the diffLimit tolerance (currently 8.6%) represents a conservative worst-case bound to accommodate precision limitations of table lookup interpolation for fractional exponents in the pow function. The exponentiation-by-squaring approach used for integer parts achieves much tighter precision, but the tolerance must account for the less precise table-based calculations used for fractional exponents.

Applied to files:

• README.md

📚 Learning: 2025-09-09T15:11:31.003Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#130
File: src/lib/implementation/LibDecimalFloatImplementation.sol:320-330
Timestamp: 2025-09-09T15:11:31.003Z
Learning: In LibDecimalFloatImplementation.sol div function, returning zero when underflowExponentBy > 76 is intentional "non-error underflow" behavior rather than reverting. This graceful handling is the main goal of the changes.

Applied to files:

• README.md

🪛 markdownlint-cli2 (0.18.1)

README.md

52-52: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above

(MD022, blanks-around-headings)

---

188-188: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above

(MD022, blanks-around-headings)

---

222-222: Files should end with a single newline character

(MD047, single-trailing-newline)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (9)

• GitHub Check: rainix (ubuntu-latest, rainix-rs-static)
• GitHub Check: rainix (macos-latest, rainix-sol-legal)
• GitHub Check: rainix (ubuntu-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-static)
• GitHub Check: rainix (macos-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, test-wasm-build)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-legal)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-test)
• GitHub Check: git-clean

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ac2e004 and 6b7a761.

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🧠 Learnings (3)

📓 Common learnings

Learnt from: 0xgleb
PR: rainlanguage/rain.math.float#59
File: crates/float/src/lib.rs:233-242
Timestamp: 2025-06-17T10:17:56.205Z
Learning: In the rainlanguage/rain.math.float repository, the maintainer 0xgleb prefers to handle documentation additions and improvements in separate issues rather than inline with feature PRs.

📚 Learning: 2025-09-28T13:28:35.814Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#144
File: test/src/lib/LibDecimalFloat.pow.t.sol:40-61
Timestamp: 2025-09-28T13:28:35.814Z
Learning: In test/src/lib/LibDecimalFloat.pow.t.sol, the diffLimit tolerance (currently 8.6%) represents a conservative worst-case bound to accommodate precision limitations of table lookup interpolation for fractional exponents in the pow function. The exponentiation-by-squaring approach used for integer parts achieves much tighter precision, but the tolerance must account for the less precise table-based calculations used for fractional exponents.

Applied to files:

• README.md

📚 Learning: 2025-09-09T15:11:31.003Z

Learnt from: thedavidmeister
PR: rainlanguage/rain.math.float#130
File: src/lib/implementation/LibDecimalFloatImplementation.sol:320-330
Timestamp: 2025-09-09T15:11:31.003Z
Learning: In LibDecimalFloatImplementation.sol div function, returning zero when underflowExponentBy > 76 is intentional "non-error underflow" behavior rather than reverting. This graceful handling is the main goal of the changes.

Applied to files:

• README.md

🪛 markdownlint-cli2 (0.18.1)

README.md

190-190: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (9)

• GitHub Check: rainix (ubuntu-latest, rainix-rs-static)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-legal)
• GitHub Check: rainix (ubuntu-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-static)
• GitHub Check: rainix (macos-latest, rainix-rs-test)
• GitHub Check: rainix (ubuntu-latest, test-wasm-build)
• GitHub Check: rainix (macos-latest, rainix-sol-legal)
• GitHub Check: rainix (ubuntu-latest, rainix-sol-test)
• GitHub Check: git-clean

[github-actions]

@coderabbitai assess this PR size classification for the totality of the PR with the following criterias and report it in your comment:

S/M/L PR Classification Guidelines:

This guide helps classify merged pull requests by effort and complexity rather than just line count. The goal is to assess the difficulty and scope of changes after they have been completed.

Small (S)

Characteristics:

• Simple bug fixes, typos, or minor refactoring
• Single-purpose changes affecting 1-2 files
• Documentation updates
• Configuration tweaks
• Changes that require minimal context to review

Review Effort: Would have taken 5-10 minutes

Examples:

• Fix typo in variable name
• Update README with new instructions
• Adjust configuration values
• Simple one-line bug fixes
• Import statement cleanup

Medium (M)

Characteristics:

• Feature additions or enhancements
• Refactoring that touches multiple files but maintains existing behavior
• Breaking changes with backward compatibility
• Changes requiring some domain knowledge to review

Review Effort: Would have taken 15-30 minutes

Examples:

• Add new feature or component
• Refactor common utility functions
• Update dependencies with minor breaking changes
• Add new component with tests
• Performance optimizations
• More complex bug fixes

Large (L)

Characteristics:

• Major feature implementations
• Breaking changes or API redesigns
• Complex refactoring across multiple modules
• New architectural patterns or significant design changes
• Changes requiring deep context and multiple review rounds

Review Effort: Would have taken 45+ minutes

Examples:

• Complete new feature with frontend/backend changes
• Protocol upgrades or breaking changes
• Major architectural refactoring
• Framework or technology upgrades

Additional Factors to Consider

When deciding between sizes, also consider:

• Test coverage impact: More comprehensive test changes lean toward larger classification
• Risk level: Changes to critical systems bump up a size category
• Team familiarity: Novel patterns or technologies increase complexity

Notes:

• the assessment must be for the totality of the PR, that means comparing the base branch to the last commit of the PR
• the assessment output must be exactly one of: S, M or L (single-line comment) in format of: SIZE={S/M/L}
• do not include any additional text, only the size classification
• your assessment comment must not include tips or additional sections
• do NOT tag me or anyone else on your comment

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Tip

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SIZE=M