Float number set from Python differs from what appears from ObjectScript

[daimor]

Describe the bug
A clear and concise description of what the bug is.

iris version/image
IRIS for UNIX (Ubuntu Server LTS for ARM64 Containers) 2023.3 (Build 231U) Thu Sep 14 2023 18:17:40 EDT

python version
iris session iris

To Reproduce

>>> iris.gref('tmp')
iris.gref('^tmp')
>>> iris.gref('tmp')[0]=123
>>> iris.gref('tmp')[0]=1.23
>>> iris.gref('tmp')[0]
1.23
>>>
irisowner@fd87b0a24405:~$ iris session iris

Node: fd87b0a24405, Instance: IRIS

USER>zw ^tmp
^tmp(0)=1.229999999999999982

USER>w $zv
IRIS for UNIX (Ubuntu Server LTS for ARM64 Containers) 2023.3 (Build 231U) Thu Sep 14 2023 18:17:40 EDT

Expected behavior
expected to have the same value in Python and in ObjectScript

[grongierisc]

For the more :

USER>zzdump $lb(1.23)

0000: 04 06 FE 7B                                             ..þ{
USER>zzdump $lb($double(1.23))

0000: 0A 08 AE 47 E1 7A 14 AE F3 3F                           ..®Gáz.®ó?

it seems that IRIS store python float as iris double (0x08) or it seems it can store it as iris float (0x06)