3205: Re-work type system to not use 'mixed' types (on hold)

ID	Project	Category	View Status	Date Submitted	Last Update

3205	Composr testing platform / automation goals	General / Uncategorised	public	2017-04-08 16:07	2019-12-01 22:53

Reporter	Chris Graham	Assigned To	Guest
Priority	normal	Severity	feature
Status	new	Resolution	open

Summary	3205: Re-work type system to not use 'mixed' types (on hold)
Description	Eliminate 'mixed' types being ever set explicitly. 'mixed' should only occur when doing type analysis and finding a conflict. Instead we will support union types. Union types will be carried with variables as an additional possibility than just a single type. The union type will never expand or switch-out, although a non-union type can become union if it has union assigned to it. Any use of 'mixed' in phpdoc should be replaced with union types. Any variable will be allowed to take a 'null' value. The mixed() function can be removed.
Additional Information	This will allow better robustness and removes the mixed() function which is currently used very inconsistently.
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Time estimation (hours)	24
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Date Modified	Username	Field	Change
2017-04-08 16:07	Chris Graham	New Issue
2019-06-27 17:16	Chris Graham	Summary	Re-work type system => Re-work type system to not use 'mixed' types
2019-11-14 22:33	Chris Graham	Relationship added	related to 2747
2019-12-01 22:53	Chris Graham	Summary	Re-work type system to not use 'mixed' types => Re-work type system to not use 'mixed' types (on hold)
2023-02-26 18:29	Chris Graham	Category	General => General / Uncategorised