[BUG] Unexpected behaviour on bash 3.x

[jgabaut]

I tested the repo on a M1 Macbook (I think it had bash 3.x) and many errors happened during operation.

Will need further investigation on last version, and I suspect the added git submodule update --init after a switch - may break stuff.
1.4.6 should not have this problem, while still having colliding filenames for the test folder...

[jgabaut]

Version 1.7.0 added a check to quit early if current bash version is <4.

Since most likely 1.8.x will use associative arrays, this issue could be closed with no fix for now.