FR: Explicit control over conversion of numbers to IntegerValue or DoubleValue

* Firebase Product: Firestore

The firestore client stores numbers that are integers as Integer values.
Obviously this can be helpful sometimes. But if I have a column that contains both integers and doubles, then the data is a mess when I import it into bigquery.
It seems like it might also make things more complicated when using the admin api from other languages that then have to deal with both types.
It'd be nice if there were some way to tell firestore to explicitly save a number as a double so this doesn't happen.