Dict\merge ordering guarnatee

[adeftu]

Please complete the information below:

What is the problem?

A dict is an ordered key-value data structure. What ordering guarantees are provided by Dict\merge:

• First all keys in $first, then all keys in $rest in order? Something else?
• Is it stable: relative order within each KeyedTraversable is preserved?

Please be explicit in the documentation about ordering guarantees: either there is no ordering guarantee or, if there is any, which one is it?

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