Fixed some typescript errors

[munteannatan]

I am researching the use of arquero in https://github.com/ni/nimble but installing the package will trigger some typescript errors when building.

I would like to not skip the lib check so I made some type fixes here.

Quite a few of them were too complex for me so I just marked them with // @ts-ignore.

Please let me know if you think there is a negative impact so I can update the changes.