Describe the bug
Vim doesn't throw any errors when a const list is filtered with filter().

According to :h :const, const is like lockvar 1 {name}. Further down the help page it says that when locking a list with lockvar 1 items cannot be added or removed from the list.

To Reproduce

1. Run vim --clean -S test.vim

function Test() abort
    const test = range(10)
    return filter(test, 'v:val % 2 == 0')
endfunction
echo Test()

2. Result:

[0, 2, 4, 6, 8]

Expected behavior
I would have expected Vim to throw an error when items are being removed from a const list.

Environment
Vim version 8.2.1464