[Voting] Feature Proposal - Deprecate crossing=zebra in favor of crossing:markings

Yes, I linked to Ohsome Dashboard earlier as a crude estimate. However, what I’d like to do is to query for crossing=zebra in 2018, then see how many of those got converted to crossing:markings=zebra versus some other crossing:markings=* value. Ohsome can’t distinguish these cases from crossings that currently have crossing:markings=* but never had crossing=zebra in the first place.

Overpass can get halfway there with its diff mode and compare statement, but I haven’t figured out how to performantly track the replacement of one tag with another on the same set of features. Still, hopefully my estimate demonstrates that crossing=zebra can refer to a variety of marking patterns, requiring us to proceed more carefully.

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