Validator "similar named ways" check gives too many false warnings

[AM909]

In r5181:

The validator's "similar named ways" gives incorrect warnings in (at least) the following situations:

• "East Foothill Drive" and "West Foothill Drive": Should not report when the diffs are just leading or trailing cardinal directions. Can be tested by a second pass at reported errors. Run both args through s/East |West |North |South | East| West| North| South//g and then diff again. If no diff, no error should be reported.

• "5th Street" and "6th Street": Should not report when the diffs are only leading numbers. Similar to above, remove all leading numbers (1st |2nd |First |Second |etc.) and diff again. No diff = no report.

In the bounding box (34.0600548, -117.7425385, 34.1251634, -117.6477814) (BLTR), at least 50 of the 56 reported "similar named ways" fall into one of these two (invalid) scenarios.

[mdk]

The same problem about railway platform names like "Gleis 1" and "Gleis 2".

[skyper]

Closed as duplicate of #3733.