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##### SUMMARY

Two vmware modules uses `copy()` to duplicate an internal instance of a pyvmomi object. This to be able to modify the object during an iteration.

- https://github.com/ansible/ansible/blob/622a493ae03bd5e5cf517d336fc426e9d12208c7/lib/ansible/modules/cloud/vmware/vmware_guest.py#L788
- https://github.com/ansible/ansible/blob/622a493ae03bd5e5cf517d336fc426e9d12208c7/lib/ansible/modules/cloud/vmware/vmware_datastore_facts.py#L220

As explain here, https://github.com/ansible/ansible/pull/60196/files#r312643761 this is not the best approach and this may impact the performance.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME

vmware

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
devel
```
if [x for x in expected_disk_spec.keys() if x.startswith('size_') or x == 'size']:
            
            if 'size' in expected_disk_spec:
                size_regex = re.compile(r'(\d+(?:\.\d+)?)([tgmkTGMK][bB])')
                disk_size_m = size_regex.match(expected_disk_spec['size'])
                try:
                    if disk_size_m:
                        expected = disk_size_m.group(1)
                        unit = disk_size_m.group(2)
                    else:
                        raise ValueError
                    if re.match(r'\d+\.\d+', expected):
                        
                        expected = float(expected)
                    else:
                        
                        expected = int(expected)
                    if not expected or not unit:
                        raise ValueError
                except (TypeError, ValueError, NameError):