log scales are easily broken

[Fil]

When setting the domain automatically, any 0 will break them.
https://observablehq.com/d/4445e77650195594

A secondary issue is that a broken dot (with a NaN screen coordinate) should not be shown, ref. #271 (comment).

[mbostock]

Maybe when inferring the domain for a log scale, if we encounter a positive value, we ignore any negative or zero values, and similarly if we encounter a negative value, we ignore any positive or zero values.