Minor BC break in gettype()

https://3v4l.org/kRON7

https://github.com/php/php-src/commit/f00d1c72b4dbaf3532569d20efc1da
7c408605d6

The above patch optimizes calls to gettype() into an opcode, however the
strings returned for closed resources has changed relative to 7.1 and
earlier.

The newer output is objectively better, but it's technically a BC break.

Was this intentional, and are we fine letting this change stand?

-Sara

This is unrelated to the linked optimizations: The change was introduced in
https://github.com/php/php-src/commit/34824b70f8e72b200d77957145bb61883b03322d
and discussed as part of https://externals.io/message/94434. Another change
from the same thread is that is_object() now returns true for all objects,
including those of incomplete classes.

Nikita

I think PHP 7.2 is a good place for these minor break.

Dmitry.