ScopePointer ::__construct and ::getObject not aligning

[DannyvdSluijs]

When doing the UT for #170 I cam across the ScopePointer which takes in any parameter into the constructor (string, int, object etc.) And based on the @return tag for the getObject it should return ClassMethod or FunctionDefinition

https://github.com/ovr/phpsa/blob/master/src/ScopePointer.php#L23
https://github.com/ovr/phpsa/blob/master/src/ScopePointer.php#L51

I guess some type of type checking needs to be added, and an exception should be thrown if not type not permitted.

[ovr]

Seems We are having 2 ways how to improve this
1.
So I suggest to build a new Interface called like ScopePointerInterface
Implement ClassMethod, FunctionDefinition with ScopePointerInterface

Add ScopePointerInterface strict
https://github.com/ovr/phpsa/blob/master/src/ScopePointer.php#L23

1. Check in __construct
2. is null
3. is object
4. is method

If not, lets throw an InvalidArgumentException

[Lexty]

As we can see AbstractDefinition::getPointer, property ScopePointer::$object can be one of the following: ClassMethod, ClosureDefinition, FunctionDefinition, ReflectionClassMethod, RuntimeClassDefinition, TraitDefinition, ClassDefinition.

So what about this version of ScopePointer?
https://github.com/Lexty/phpsa/blob/182-scope-pointer-strict-type/src/ScopePointer.php

[ddmler]

So what about this version of ScopePointer?
https://github.com/Lexty/phpsa/blob/182-scope-pointer-strict-type/src/ScopePointer.php

ping @ovr @K-Phoen