I propose to migrate sidewalk=none to sidewalk=no with an automated edit that I would perform.
Some discussion is already at https://community.openstreetmap.org/t/sidewalk-none-to-no-proposed-automated-edit/128842 It is a very minor improvement, but still removes one piece of annoyance for new data consumers and for anyone looking at raw tags. Yes, it is a tiny change and nothing groundbreaking and having synonyms is not even in top 10 of annoyances for data consumers. But such change is an improvement and easy to do. The only cost is making edit itself which will cause objects to be edited. Note that this change will not break any data consumers as it changes to a far more popular alternative. It is far preferable to do it with automatic bot edit over doing it as a validator rule in editors or doing it manually as it is pointless to spend human effort or attention on such drudgey of changing several thousands tags manually, one at time. In my experience objects with such tag are not useful identifications of bad tagging deserving human attention. If anyone is interested in such useful detectors where human attention would be useful, let me know (with preferences for area and/or topic and/or editing type and other similar preferences if any). Edit proposed here would be global and recurring, retagging also future occurrences of such tagging. Note, I already performed such edit for limited geographic area where there was agreement from local community. wiki documentation page is up on https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account/retag_sidewalk%3Dnone see also https://wiki.openstreetmap.org/wiki/Talk:Key:sidewalk#Is_sidewalk.3Dnone_valid.3F https://wiki.openstreetmap.org/wiki/Key:sidewalk#Deprecation_of_sidewalk=none https://wiki.openstreetmap.org/wiki/Talk:Key:sidewalk#Is_sidewalk.3Dnone_valid.3F https://josm.openstreetmap.de/ticket/21242 https://github.com/streetcomplete/StreetComplete/pull/3194 https://github.com/openstreetmap/id-tagging-schema/pull/222 https://taginfo.openstreetmap.org/tags/sidewalk=none#chronology
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