Re: [dom] Consider banning insertNode() of the Range's start node (#63)

I would have added principal 3 (which should be stronger than 1 or 2), be consistent whenever possible. No special cases unless absolutely needed. Inconsistencies make (a) implementations just more complicated and (b) tend to lead harder to read specs and (c) harder to understand APIs.

In other words, I don't understand the need for this change.
(Range API used to be internally more consistent but some hacks have been added to it over the time.)

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