panic: morton64 with 32 bits per dimension received signed -9223372036854775808 to pack

When we try to use a hex_id with a negative value (for example, -4611686018427391893 - int64) we can find its center without errors (POINT (2.893676000981707085+09, -90), then we use these coordinates for searching hex_id by point. In this case, we get hex
INFO [0001] {-9223372036854775808 -9223372036854775808}
And then we try to SPack these values with Morton64 lib, we catch the panic of the service.
https://github.com/gojuno/go.morton/blob/94709bd871ce24bf7892c006badb19b85777dae1/morton64.go#L77

Is it possible in some way to forward an error or get rid of panic?

Start at morton64.go line 77 and reproduce the panic with the negative hex_id and the resulting -9223372036854775808 coordinate values. Determine the library's intended behavior for out-of-range signed inputs; done means the case no longer panics and its outcome is covered by an appropriate regression check.

Written by the indexing model from the issue text.