TST: Make assert_extension_array_equal behavior consistent
- [X] closes #23709
- [X] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Doesn't seem like a whatsnew entry is needed for this, but can add one if need be.

This should also address #23605; I don't want to autoclose it, as I'd rather wait to confirm that the nightly build passes after this is merged.

Hello @jschendel! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/tests/util/test_testing.py`](https://github.com/jschendel/pandas/blob/da1059d8bdf89667724d4748789cef134ee98ce5/pandas/tests/util/test_testing.py) !

 - There are no PEP8 issues in the file [`pandas/util/testing.py`](https://github.com/jschendel/pandas/blob/da1059d8bdf89667724d4748789cef134ee98ce5/pandas/util/testing.py) !

 Seems like a precision issue on the py2 test: https://travis-ci.org/pandas-dev/pandas/jobs/457327081#L2551 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=h1) Report
> Merging [#23808](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/df5eeece8ed28462832ee6e762192629c446670c?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/23808/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #23808      +/-   ##
==========================================
+ Coverage   92.28%   92.28%   +<.01%     
==========================================
  Files         161      161              
  Lines       51457    51465       +8     
==========================================
+ Hits        47489    47497       +8     
  Misses       3968     3968
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.68% <100%> (ø)` | :arrow_up: |
| #single | `42.31% <100%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/23808/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `86.09% <100%> (+0.05%)` | :arrow_up: |
| [pandas/core/tools/timedeltas.py](https://codecov.io/gh/pandas-dev/pandas/pull/23808/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdG9vbHMvdGltZWRlbHRhcy5weQ==) | `98.03% <0%> (ø)` | :arrow_up: |
| [pandas/core/resample.py](https://codecov.io/gh/pandas-dev/pandas/pull/23808/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzYW1wbGUucHk=) | `96.99% <0%> (ø)` | :arrow_up: |
| [pandas/core/dtypes/cast.py](https://codecov.io/gh/pandas-dev/pandas/pull/23808/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZHR5cGVzL2Nhc3QucHk=) | `88.99% <0%> (+0.07%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=footer). Last update [df5eeec...ee46ee0](https://codecov.io/gh/pandas-dev/pandas/pull/23808?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @jschendel thanks! Should #23605 also be closed? > Should #23605 also be closed?

Yes, will close that issue manually.  The latest pandas-wheels build was successful, which looks to include this PR based on the time at which it was started: https://travis-ci.org/MacPython/pandas-wheels/builds/457775113 yep looks like the 32 bit are finally fixed thanks!