Cache the results of a WalkMapper (#106)
* Cache the results of a WalkMapper
Array expressions are a DAG, if an expression is traversed do not re-traverse it.
* subclass CachedWalkMapper from WalkMapper
not all WalkMappers might want to be cached walk mappers
* Add CachedWalkMapper to docs
Co-authored-by:
Andreas Klöckner <inform@tiker.net>
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