Description:
------------
Through at least version 5.2.9, ip2long() returned the input value 
unchanged for valid integer IP address inputs.

Since at least version 5.2.11, ip2long() returns "false" for all 
integer IP address inputs. (5.2.12 and 5.2.11 tested, 5.2.10 
untested).

Our application has been utilizing this function for the past three 
years, originally deployed on 5.1.(6?). Since both string and long IP 
addresses returned valid long results, the function returned valid 
results regardless of the format. This is useful when importing from 
data sources containing inconsistent representations.

The specification of the function's valid input and outputs has been 
changed and made more restrictive, yet there is no changelog entry 
documenting this incompatible change.

Reproduce code:
---------------
---
From manual page: function.ip2long#Changelog
---

echo ip2long("73.150.2.210");
echo ip2long(1234567890);


Expected result:
----------------
Expected return value (through 5.2.9) is the integer "1234567890" for 
both inputs.

Actual result:
--------------
Actual return value (since 5.2.11 or .10) is "false" for the long input, 
correct for the string input.