lazyActions

Answer the bundle trees that will be reached when specific parse instructions run. During normal processing, all such instructions are attempted in parallel. Certain instructions like ParsePart do not get added to this map, and are instead added to other structures such as lazyIncomplete.

Each key is an integer that encodes a parsing instruction, and the value is a tuple of successor bundle trees that are reached after executing that parsing instruction. The tuples are typically of size one, but some instructions require the parsings to diverge, for example when running macro prefix functions.

This is only an authoritative map if an expand has been invoked since the last modification via methods like addPlanInProgress.