REF: Fuse all the types
Everything is passing locally, just want to run this through the CI for good measure before continuing down this path.
Hello @jbrockmendel! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/core/internals/blocks.py`](https://github.com/jbrockmendel/pandas/blob/e6002779e10a3bc738d9905bf415ee2f433e20bb/pandas/core/internals/blocks.py) !

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23022?src=pr&el=h1) Report
> Merging [#23022](https://codecov.io/gh/pandas-dev/pandas/pull/23022?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/913f71f74709e4d4814e50f21768b97ce2c6ef8d?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/23022/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23022?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #23022   +/-   ##
=======================================
  Coverage   92.19%   92.19%           
=======================================
  Files         169      169           
  Lines       50959    50959           
=======================================
  Hits        46980    46980           
  Misses       3979     3979
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.61% <ø> (ø)` | :arrow_up: |
| #single | `42.29% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23022?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/23022?src=pr&el=footer). Last update [913f71f...400e708](https://codecov.io/gh/pandas-dev/pandas/pull/23022?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Just pushed, moving some more functions over.  I think I should stop here for this PR before the diff gets out of hand.

Made a bug report to cython about a mysterious failure. Thoughts here? @datapythonista I don’t understand what is causing the travis failure.  Do you recognize it? I'mc checking from my cell phone which makes it tricky to check, but if I see it correctly, this is the error: `pandas/_libs/algos_rank_helper.pxi.in:177:80: E501 line too long (80 > 79 characters)`. thanks!