html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/1075#issuecomment-719980742,https://api.github.com/repos/simonw/datasette/issues/1075,719980742,MDEyOklzc3VlQ29tbWVudDcxOTk4MDc0Mg==,9599,2020-10-31T19:58:57Z,2020-10-31T19:58:57Z,OWNER,"Sample traceback:
```
    <link rel=""stylesheet"" href=""{{ urls.static('app.css') }}?{{ app_css_hash }}"">
/opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/site-packages/jinja2/asyncsupport.py:173: in auto_await
    if inspect.isawaitable(value):
/opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/inspect.py:226: in isawaitable
    isinstance(object, collections.abc.Awaitable))
/opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/abc.py:139: in __instancecheck__
    return _abc_instancecheck(cls, instance)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

cls = <class 'collections.abc.Awaitable'>
subclass = <bound method PrefixedUrlString.__getattribute__.<locals>.method of '/-/static/app.css'>

    def __subclasscheck__(cls, subclass):
        """"""Override for issubclass(subclass, cls).""""""
>       return _abc_subclasscheck(cls, subclass)
E       TypeError: issubclass() arg 1 must be a class
```
This is within Jinja. It looks like Jinja really doesn't like methods that return non-string objects like `PrefixedUrlString`.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",733796942,
https://github.com/simonw/datasette/issues/1075#issuecomment-719981173,https://api.github.com/repos/simonw/datasette/issues/1075,719981173,MDEyOklzc3VlQ29tbWVudDcxOTk4MTE3Mw==,9599,2020-10-31T20:02:30Z,2020-10-31T20:03:45Z,OWNER,"I wonder how Jinja's `Markup()` class works? It uses https://pypi.org/project/MarkupSafe/

It's a subclass of `str`, defined here: https://github.com/pallets/markupsafe/blob/master/src/markupsafe/__init__.py","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",733796942,
https://github.com/simonw/datasette/issues/1075#issuecomment-719983240,https://api.github.com/repos/simonw/datasette/issues/1075,719983240,MDEyOklzc3VlQ29tbWVudDcxOTk4MzI0MA==,9599,2020-10-31T20:18:49Z,2020-10-31T20:18:49Z,OWNER,"Here's the core problem:
```
(Pdb) isinstance('bob', collections.abc.Awaitable)
False
(Pdb) isinstance(PrefixedUrlString('bob'), collections.abc.Awaitable)
*** TypeError: issubclass() arg 1 must be a class
```
For some reason `isinstance()` does not like being handed an instance of PrefixedUrlString.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",733796942,
https://github.com/simonw/datasette/issues/1075#issuecomment-719983484,https://api.github.com/repos/simonw/datasette/issues/1075,719983484,MDEyOklzc3VlQ29tbWVudDcxOTk4MzQ4NA==,9599,2020-10-31T20:20:28Z,2020-10-31T20:20:28Z,OWNER,"It looks like this is specific to the way `PrefixedUrlString` is built.
```
(Pdb) class Weird(str): pass
(Pdb) isinstance(Weird('bob'), collections.abc.Awaitable)
False
```
So subclassing strings doesn't trigger this bug, but something about `PrefixedUrlString` causes the problem.

Here's the current `PrefixedUrlString` implementation:

https://github.com/simonw/datasette/blob/bf18b9ba175a7b25fb8b765847397dd6efb8bb7b/datasette/utils/__init__.py#L1015-L1035","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",733796942,
https://github.com/simonw/datasette/issues/1075#issuecomment-719983565,https://api.github.com/repos/simonw/datasette/issues/1075,719983565,MDEyOklzc3VlQ29tbWVudDcxOTk4MzU2NQ==,9599,2020-10-31T20:21:03Z,2020-10-31T20:21:03Z,OWNER,"Here's the output of `dir(str)`:

`['__add__', '__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmod__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'capitalize', 'casefold', 'center', 'count', 'encode', 'endswith', 'expandtabs', 'find', 'format', 'format_map', 'index', 'isalnum', 'isalpha', 'isascii', 'isdecimal', 'isdigit', 'isidentifier', 'islower', 'isnumeric', 'isprintable', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'maketrans', 'partition', 'replace', 'rfind', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']`","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",733796942,
https://github.com/simonw/datasette/issues/1075#issuecomment-719983750,https://api.github.com/repos/simonw/datasette/issues/1075,719983750,MDEyOklzc3VlQ29tbWVudDcxOTk4Mzc1MA==,9599,2020-10-31T20:22:29Z,2020-10-31T20:22:29Z,OWNER,I bet this is because I'm mucking around with one of those `__` methods. I'll try just doing the non-underscore methods instead.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",733796942,