[vim9script] Behavior of has_key()

The help entry for has_key() says that the key must be a string. In
legacy Vim script, however, this works fine:

let dd = {42: '42', v:true: 'T', 3.14: '3.14'}
echo dd->has_key(42)
echo dd->has_key(v:true)
echo dd->has_key(3.14)

In Vim 9 script, the behavior is different:

vim9script
const dd = {42: '42', true: 'T', [3.14]: '3.14'}
echo dd->has_key(42) # OK
echo dd->has_key(v:true) # Error, must be string(v:true)
echo dd->has_key(3.14) # Error, must be string(3.14)

This seems a bit inconsistent to me. I don't have a problem with Vim
9 script being different from legacy script, but I think that either all
the three cases should raise an error, or none of them.

Besides, the documentation does not make it clear that implicit type
casting may happen.

Life.


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