How to configure db.count() to return a `number` type?

[echentw]

I found this related thread: #176

In my codebase, we've configured node-pg to return a typescript number if the data type is postgres BIGINT.

Is there a way to configure mammoth to tag this return type with number instead of string?

const {count} = (await db.count() ...);
// The type-system thinks `count` is a string, but the runtime value is number.