history-size reported as "0" even is value is "-1"

[Sebastian Carlos]

Hello,

history-size is documented as follows:
> If set to a value less than zero, the number of history entries is not
limited.

But after setting it to "-1", for example with this line in .inputrc:
> set history-size -1

It is still reported as "0" in "bind -v":
> set history-size 0

Nevertheless, it's clear that the actual value is not zero because, for
example, history entries are not deleted.

Thanks.