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iftype has been around for a long time but was never documented beyond a keyword table entry. This adds a full section covering basic syntax, type narrowing, elseif chaining, capability conditions, tuple conditions, and limitations, with 5 compilable code samples. Also updates the keywords table, symbol lookup cheat sheet, and adds a cross-reference from the generics constraints page. Closes #393
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Adds documentation for
iftypeto the control structures page, covering:thenbranchelseifchaining for multiple type checksref,box, etc.)else None)Includes 5 compilable code samples, updates to the keywords table and
symbol lookup cheat sheet, a cross-reference from the generics constraints
page, and a cspell dictionary addition.
Parked review item
The basic example's
elsebranch prints "woof" (implying a Cat-vs-Dogdichotomy) rather than something type-neutral like "not a cat". The
elseactually catches anything that isn't
Cat. The prose explains this correctlybut the example could reinforce a wrong mental model. Low severity —
flagged during review as a pedagogical judgment call.
Closes #393