When I create a tag like “12.6”，it’s forced to “126”，missing the dot.
I’m afraid full stops aren’t permitted in tag names, so this is working as expected.
But why aren’t permitted.
Good question. I’m afraid I only know that they’re not allowed, rather than why.
Looking through the Related Topics at the bottom of this one it seems like they were deemed more trouble than they’re worth back in 2018:
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