[ruby-core:101464] [Ruby master Bug#17395] Kernel::Integer does not raise ArgumentError for strings with whitespace padding

Issue #17395 has been reported by mikelikesbikes (Mike Busch).

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Bug #17395: Kernel::Integer does not raise ArgumentError for strings with whitespace padding
https://bugs.ruby-lang.org/issues/17395

* Author: mikelikesbikes (Mike Busch)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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According to the Kernel::Integer docs, ArgumentError should be raised if the argument is a String and doesn't conform with numerical representation. However, it appears that Kernel::Integer does not raise ArgumentError when a string contains leading or trailing whitespace.

Ruby Version: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin18]

Reproduce Steps:
```
Integer(" 1")
Integer("1 ")
```

Actual Results:
both parse to a valid Integer, 1, no exception is raised.

Expected Results:
both should raise ArgumentError because they contain non-numerical characters




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