[VarExporter] Improve partial-initialization API for ghost objects #48312
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Discussed with @alcaeus at SymfonyCon, this improves support for partial-initialization of lazy ghost objects.
isLazyObjectInitialized(bool $partial = false): bool
allows checking if an object is partially-initialized."\0"
key can be used to initialize all/many properties at once.Targeting 6.2 because this would be a BC break in 6.3, also because this improves a new unreleased feature.