A few weeks ago I read (it could be on this forum) that the TO-220 could not have 100A through the pins, even though the mosfet was specified for that amount of current.
I wondered about that myself... having worked a fair bit on big-ass electrical installation jobs and seeing the size of conductors needed to handle 100A, I thought seeing TO-220 packaged parts being rated for hundreds of amps seemed a bit ridiculous!
Actually TO220 package can take 100A, just not for very long! Its the gold bonding wires to the chip itself that
will fail first, and at very high currents the magnetic force may break them before they vaporize for all I know!