Very slow fit call

I'm not sure if it is a bug, but this happens in our use case.

This runs quickly:

```julia
using StatsBase: fit, Histogram

fit(Histogram, [-5.6,-5.6])
```

This takes a very long time:

```julia
using StatsBase: fit, Histogram

fit(Histogram, [-5.603325961434038e29,-5.603325961434038e29])
```