typeof() creates elements in an array

[Ivo Palli]

Hiya,

After sparring about this on the help mailinglist, I decided to upgrade
this to a bug.

This:

split("123", arr, "");
print typeof(arr[0]);

creates a new element on arr[0]. (length(arr)==4)

This is unexpected since the manual

https://www.gnu.org/software/gawk/manual/html_node/Type-Functions.html

says:

> Normally, passing a variable that has never been used to a built-in
> function causes it to become a scalar variable (unassigned). However,
> isarray() and typeof() are different; they do not change their arguments
> from untyped to unassigned.

As a regular user I would not expect new elements to be created, and
honestly I don't see this behavior as useful. I suggest changing it so
new elements are not created anymore. If this can not be done due to
language constructs for example, I suggest adding a caveat in the manual.

Regards,

   Ivo Palli