♻️ Make Ok() a singleton

[cowboyd]

Motivation

Save allocations along hot paths. Ok() is fundamental construct of flow control and error reporting in effection, it gets allocated a lot, and is used on paths both hot and cold.

Approach

Collapse every Ok() into a single object instance.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/effection@1176

commit: 5783766

[codspeed-hq]

Merging this PR will not alter performance

✅ 6 untouched benchmarks

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_{Comparing singleton-undef (5783766) with v4 (82bd953)}