Insert bug when indexing the data set of 'double' key type

[baotonglu]

Hi,

When I tested the uTree (multi-thread version) using the 'double' type data sets, I observe that some key-value records cannot be inserted even if I only use one thread.
It hits this condition and directly returns.

The data sets I tested are longlat and longitudes. The method to read the keys from the file is here.
Could you take a look how to fix it?

Best,
Baotong