Script variables not picked up from shell arithmetic

[oiffrig]

What happened?

PyFlow does not generate exports for variables used only in shell arithmetic expressions. It is quite easily worked around, but still confusing. May be worth either documenting it, or fixing it somehow.

What are the steps to reproduce the bug?

loop_script = """
for (( i = 0; i < NUM_ITER ; i++ )) ; do
    echo $i
done
"""

pf.Task("loop", script=loop_script, variables={"NUM_ITER": 5})

Version

3.2.1

Platform (OS and architecture)

ECMWF HPC

Relevant log output

No response

Accompanying data

No response

Organisation

No response