[#7292] BUG: asfreq / pct_change strange behavior 
- [x] closes https://github.com/pandas-dev/pandas/issues/7292
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

can u add tests from the original issue Hi Jeff, can you clarify above comment? Do you mean assert pct_change(periods=5) == pct_change(periods=1, freq='5H'), as raised in the original issue? the idea is that the original should fail w/o your fix and pass with it # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19410?src=pr&el=h1) Report
> Merging [#19410](https://codecov.io/gh/pandas-dev/pandas/pull/19410?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/8a7aca9eda989243fedae4ef525ddef4511ab241?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19410/graphs/tree.svg?width=650&src=pr&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/19410?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #19410      +/-   ##
==========================================
- Coverage   91.62%   91.62%   -0.01%     
==========================================
  Files         150      150              
  Lines       48729    48725       -4     
==========================================
- Hits        44649    44645       -4     
  Misses       4080     4080
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.99% <100%> (-0.01%)` | :arrow_down: |
| #single | `41.74% <0%> (-0.01%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19410?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ2VuZXJpYy5weQ==) | `95.91% <100%> (ø)` | :arrow_up: |
| [pandas/core/indexes/multi.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9tdWx0aS5weQ==) | `95.14% <0%> (-1.09%)` | :arrow_down: |
| [pandas/core/sparse/array.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3BhcnNlL2FycmF5LnB5) | `91.48% <0%> (-0.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.57% <0%> (-0.05%)` | :arrow_down: |
| [pandas/core/sparse/series.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3BhcnNlL3Nlcmllcy5weQ==) | `95.26% <0%> (-0.04%)` | :arrow_down: |
| [pandas/core/indexes/numeric.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9udW1lcmljLnB5) | `97.24% <0%> (-0.04%)` | :arrow_down: |
| [pandas/core/indexes/timedeltas.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy90aW1lZGVsdGFzLnB5) | `90.56% <0%> (-0.02%)` | :arrow_down: |
| [pandas/core/indexes/interval.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9pbnRlcnZhbC5weQ==) | `92.39% <0%> (-0.02%)` | :arrow_down: |
| [pandas/core/indexes/period.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9wZXJpb2QucHk=) | `92.99% <0%> (-0.02%)` | :arrow_down: |
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.45% <0%> (-0.01%)` | :arrow_down: |
| ... and [7 more](https://codecov.io/gh/pandas-dev/pandas/pull/19410/diff?src=pr&el=tree-more) | |

------

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> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19410?src=pr&el=footer). Last update [8a7aca9...75b8942](https://codecov.io/gh/pandas-dev/pandas/pull/19410?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 added test cases (frame and series) against original issue raised. @jreback  @jreback @TomAugspurger let me know if this is good to go, otherwise have a good weekend. :) @jreback @TomAugspurger is this good to go?  @TomAugspurger reviews actioned. thanks @minggli  happy to contribute! 🚀 