DEPR: is_extension_type
It is mostly redundant with `is_extension_array_dtype`, and having both is confusing.

xref #23179.
Can this not be removed outright? It's non-public and sits behind an experimental interface, so I think not worth the effort of a deprecation cycle i wouldnt shed any tears if we removed it altogether I'm +1 to outright remove but let's see what @TomAugspurger and @jreback think is this in pd.api.types?

if not ok to remove It’s not public right? So fine to just remove.

This predated the EA interface. 

> On Nov 7, 2019, at 18:23, William Ayd <notifications@github.com> wrote:
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> I'm +1 to outright remove but let's see what @TomAugspurger and @jreback think
> 
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 > is this in pd.api.types?

Yes, this is in pd.api.types.  (via a `*` import) > > is this in pd.api.types?
> 
> Yes, this is in pd.api.types. (via a `*` import)

really? it has a test that catches the earning? We have tests (updated appropriately in this PR) for deprecated functions
in this module.

On Thu, Nov 7, 2019 at 5:29 PM Jeff Reback <notifications@github.com> wrote:

> is this in pd.api.types?
>
> Yes, this is in pd.api.types. (via a * import)
>
> really? it has a test that catches the earning?
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 ok i see the change now, yeah have to deprecate

can u add to the master depreciation issue (or create say a 1.2 removals issue) > can u add to the master depreciation issue (or create say a 1.2 removals issue)

will do thanks @jbrockmendel 