Bypass edge restriction checks when edges=*

Closes #1922 (closed).

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Migrated from D1753 (view on Phabricator)

I was more thinking of lifting this up to the traversal algo, ideally not having to do a test at every edge that is followed. Done this way, this is not gonna gain you much, only a couple of array lookup per edge.

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Move bypass check to Neighbors iterator upper-level class.

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Use special null value in boolean array to quickly bypass edge check when no edge restriction is enforced.

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approved this merge request

Some references in the commit message have been migrated:

• T1922 is now #1922 (closed)

Rebasing on master

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closed