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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Yeah, that caught me off guard too. The description needs a bit of rework.
Nope, it means it is the delimiter between the latitute and the longitude. The description is technically correct since a comma can and will be in the string.
Commas are used as delimiters in this scenario, therefore your example of "0, 1,2" treats it like [0, 1, 2] instead of [1, 1.2].
We are using full stops "." as decimal point markers, not commas. So "0, 1.2" is valid but "0, 1,2" is not because "0, 1,2" has three values instead of 2 (lat and long)