Use an enum for 'opt' in forderLazy
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 40/100
Research direction
Locate the forderLazy implementation and its related tests, then compare the existing opt comment with how the tests interpret its values. The work is done when opt uses an enum, verbose output can convert that enum to a string, and the tests explain the option meanings without cross-referencing source.
Written by the indexing model from the issue text.
Description
This comment is nice, but the tests are still very hard to understand without referencing back+forth the source code here. WDYT about using an `enum` instead? (including a method to convert `enum`->string for `verbose` printing)
Originally posted by @MichaelChirico in https://github.com/Rdatatable/data.table/pull/4386#discussion_r1525789093
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