Olaf Dabrunz wrote:
> Example:
>
> :let d = {'a': 99, 'b': 100}
> :lockvar 1 d
> :call extend(d, {'a': 123})
> E741: Value is locked: extend() argument
> :let d.a = 123
> :let d
> d {'a': 123, 'b': 100}
>
> The dictionary is locked, but the 'a' item is not, so extend() on 'a'
> should succeed in the same way as the 'let' does. According to ':he
> lockvar', a dictionary lock protects against item deletion and addition,
> but not against changing an existing item.
Hmm, one could argue that extend() adds the new key/value pair, thus
that it should fail.
Zyx's argument that it may change one existing key/value but then fail
on a following one that adds a key makes sense. Perhaps we should just
state "extend() on a locked list or dict does not work".
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