Inside a carburetor float

[scar]

I have a Tillotson carburetor that I'm rebuilding.
I took the float out and when I shook it, it has a
liquid inside.
I see that there's a drop of solder at the end of the
float like something was put inside of it at the factory and then soldered up.
I've looked over the float but i don't see where gas could have gotten in. Nothing will come back out.
I didn't know if it is supposed to have a liquid inside or if it's supposed to be empty.