tricky...
- the only way I found to express the concept of the "associated type"
(in Rust lingo) model_type was by making Type generic over its value
and null types.
- in addition, the class hierarchy of Integer and Float types had to be
modified, since previously some of them would have conflicting null
types relative to their super class (this required a change to the
edit plugin; hopefully no more breakage is caused by these changes)
- don't import the query module, but only the relevant Query's to avoid
confusing the module query and the class variable query
As far as I can tell, the fast SQL path was never used before, since a
query would use the default `clause()` implementation. It is only the
`FieldQuery.clause()` that could delegate to `col_clause()`, but
`PlaylistQuery` is not a `FieldQuery`.
- Add NamedQuery abstract class to be able to express the expectation
that a query should be such a query (and have a specific constructor
signature) in construct_query_part
- slightly (and probably completely irrelevantly) improve Query.__hash__
- also, sprinkle some ABC/abstractmethod around to clarify things
fanart.tv uses a string to output the number of likes (see https://fanart.tv/api-docs/api-v3/). In order to sort numerically we need to convert the string into an int.
cf. @arogl's comment 254bb297c8 (commitcomment-111922347)
> Now that this has been merged, external plugins that add to the fetchart plugin now fail with:
>
> ```AttributeError: module 'beetsplug.fetchart' has no attribute 'SOURCES_ALL'``
cf. https://github.com/pallets/werkzeug/issues/2506
didn't check when part_isolating was introduced, but presumably, it
should be harmless to set this attribute for old werkzeug versions that
didn't have it yet
