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union of two psMaps

creates a new psMap that maps all the keys that exist either in psMap.this
or in other to the values they are mapped to. In case a key k exists in
both psMap.this and other, it will be mapped to psMap.this[k] or to other[k],
but it is undefined to which of these two.

helper to add 'psMap.this.data[l..r]' to 'a' and return the resulting map.

helper to add 'sz' elements from 'psMap.this.data[at..at+sz]' to 'a', with
'tail' elements at indices larger or equal to 'at+sz' added recursively as