[BUG] Construction of Interval restricted to numeric/ Timestamp/ Timedelta (#23013)
State: closed

-  closes #23013
-  1 test replaced
-  passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
-  whatsnew entry


Labels:
name: Dtype Conversions
description: Unexpected or buggy dtype conversions
name: Interval
description: Interval data type

Comments:
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=h1) Report
> Merging [#25768](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/e8d951d2edef5df2cc7bf60e90f345fd5fd18a6b?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25768/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #25768   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files         172      172           
  Lines       52965    52965           
=======================================
  Hits        48335    48335           
  Misses       4630     4630
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.83% <ø> (ø)` | :arrow_up: |
| #single | `41.74% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25768?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/25768?src=pr&el=footer). Last update [e8d951d...4a59b6e](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=h1) Report
> Merging [#25768](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/cdfdd77b65df350386ce27142ef3babd9e5186d2?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25768/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #25768      +/-   ##
==========================================
+ Coverage   91.27%   91.27%   +<.01%     
==========================================
  Files         173      173              
  Lines       53002    53002              
==========================================
+ Hits        48375    48376       +1     
+ Misses       4627     4626       -1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.83% <ø> (ø)` | :arrow_up: |
| #single | `41.76% <ø> (-0.01%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/25768/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `89.4% <0%> (+0.1%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25768?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/25768?src=pr&el=footer). Last update [cdfdd77...df59032](https://codecov.io/gh/pandas-dev/pandas/pull/25768?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

pls merge master
lgtm. @jschendel 
thanks @makbigc