Must Homepage Meta Keywords (in the built in SEO options) be separated by comma only (a,b,c,d) or by a comma and a space (a, b, c, d)? Or doesn't that really matter? Question sounds easy, but haven't found any clear answer till now ...

Either the question is "stupid" – or more difficult to answer than I thought ... Anyway: I put it back to top, still hoping for an answer.

Doesn't make a bit of difference.