truncation of pupil/field coordinates in getTrace() and other related functions

[robbarnsley]

Hi,

First off, thanks for the work you put into this.

I have an issue with:

https://github.com/indranilsinharoy/PyZDDE/blob/45dff7042b074574ef0ba5b6e8ee4155689f02bf/pyzdde/zdde.py#L3396

I am unsure why the float is truncated to 4 dp - it seems you're unnecessarily throwing away 32bit float precision. I have a ZPL macro utilitising a raytrace that is particularly sensitive to the pupil/field coordinates and the code above produces inconsistent results between ZPL/PyZDDE raytrace calls with the same input parameters.