Add public scope() method to TemplateValues#77
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TemplateValues already supports parent-scoped lookup internally via _create (used by _override for loop variables). scope() exposes this as a public API: it creates an empty writable child backed by the receiver as a read-only parent, so lookups that miss in the child fall through to the parent chain. The motivating use case is livery's LiveView.render, where the backing TemplateValues is seen as box through viewpoint adaptation. scope() lets the view get a writable TemplateValues that inherits existing assigns without copying data or modifying the original. Also adds a docstring to the existing update() method, which was the only public API element on TemplateValues without one. Closes #76
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TemplateValues already supports parent-scoped lookup internally via the package-private
_createconstructor (used by_overridefor loop variables).scope()exposes this as a public API: it creates an empty writable child backed by the receiver as a read-only parent, so lookups that miss in the child fall through to the parent chain.The motivating use case is livery's
LiveView.render, where the backingTemplateValuesis seen asboxthrough viewpoint adaptation.scope()lets the view get a writableTemplateValuesthat inherits existing assigns without copying data or modifying the original.Closes #76