definitions: Update certain keys to use union types when they are available
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	DMartin-WMF
	Jun 11 2025, 6:18 AM

Description

The following keys should be updated to take advantage of union types when they are available (see T292892 & T296326).

These are related to the instantiation of Wikidata content (and other groupings can be added below):

Z6010K2: Should allow for Z19677/Rational number and also Z24/void
Z6010K3: Should allow for Z19677/Rational number and also Z24/void
Z6011K3: Should allow for Z19677/Rational number and also Z24/void
Z6011K4: Should allow for Z6091/Wikidata item reference and also Z24/void
Z20342K1: Should allow for Z16098/Gregorian calendar month and also Z24/void

Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)

Status	Assigned	Task
Open	None	T396553 definitions: Update certain keys to use union types when they are available
Open	None	T292892 Function model: Introduce a Union generic type
Resolved	cmassaro	T294135 Run All Validation as WikiFunctions
Open	None	T296326 Discuss How to Implement Unions
Resolved	• AAssaf	T307699 Formalize the semantics of the function model