Variant.getSize

Determines the number of bytes that would be required to store value with [glib.variant.Variant.store].

If value has a fixed-sized type then this function always returned that fixed size.

In the case that value is already in serialized form or the size has already been calculated (ie: this function has been called before) then this function is O(1). Otherwise, the size is calculated, an operation which is approximately O(n) in the number of values involved.