[Bug 22761] Maps, esp. map creation is not part of streamability analysis

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22761

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
Should we retain the rule that if there are duplicate keys, the last one wins?
When the key/value pairs are evaluated in parallel, this rule is more difficult
to implement.

Alternative rules:

(a) duplicate keys are a dynamic error

(b) if there are duplicate keys it is implementation-dependent which one wins

I'm inclined towards (a).

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