Fix function arity issues

[bvaughn]

Flow 0.46+ supports verifying the number of arguments passed to a function.

Enabling this feature (experimental.strict_call_arity=true) and updating to Flow ^0.46.0 in master results in 40 arity errors.

• PR Fixed misc function arity issues #9816 reduces this to 28 errors.
• Fix remaining errors

[iamdustan]

Want me to rebase #9815 later?

[bvaughn]

Oh hey! Didn't see that PR yet.

PR #9816 resolves a few of the issues but not all of them. Happy to help track down the others.

[gaearon]

So did #9815 enable arity checks? Or do they need explicit opt in?

[bvaughn]

Looks like #9815 turned them on, based on this which says:

Flow v0.47.0 will ship with strict function call arity turned on and the experimental.strict_call_arity flag will be removed.

I'm guessing that means we can close this now. I'm going to do that. If anyone knows of a reason to reopen it, let me know. 😄