:bug: InDat reading coverts integers to floats

[je-cook]

Describe the bug

On reading in an existing IN.DAT and then writing it out again some integers are converted to floats when running the rewritten IN.DAT PROCESS falls over

Steps to reproduce

st_regress = "st_regression.IN.DAT"
out = InDat(filename=st_regress)
out.data['i_pf_location"].get_value  # [2.0, 3.0, 3.0, 4.0],  should be integers

out.write_in_dat(output_filename="new.IN.DAT")  # run this file and it process doesnt like it

Expected behaviour

Evidence

Environment

• OS:
• Version:

Additional context

[timothy-nunn]

I am able to replicate half of this issue.

out.data["i_pf_location"].get_value does indeed return a list of floats (wrong).

But I am having no issues running the new.IN.DAT. The relevant line in the new input file reads i_pf_location = 2,3,3,4 * Switch for location of PF coil group i; as expected.

[je-cook]

that could well be to do with how I approximate invariable on my side, I can nearly guarantee it. #3899 is more worrying to me!