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I hope they carefully ponder the coding convention they use in the examples, because so many people will reproduce them.

For instance I don't love the ( parens spacing ), is there a good reason for these added spaces?

As long as it's internally consistent, I'm OK with it; that space is common enough (WordPress core style employs spaces like that).

That's just a standard the team uses, all of the code in the source is formatted that way.