lean-ja / lean-ja/lean-by-example
型強制は常に単射であるべき？
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Zulipで質問すべき
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- Lean
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Description
たとえば String → Bool を「空なら false で空でないなら true 」と設定すると単射にならない。ユーザーが困惑したりバグの原因になったりする可能性が高く、これは型強制として設定するべきではないだろう。
Coe のドキュメントコメントに追記してもよいレベルで、これは推奨されることなのだろうか？
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the existing Coe documentation comments and the surrounding guidance on type coercions. Determine whether the injectivity concern warrants an explicit recommendation, then document the agreed guidance in the appropriate Coe comment; done means the recommendation and its rationale are clear to users.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Documentation
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100