Fix regression of generic T assignability to Partial<T>

[andrewbranch]

I think this fixes #32340.

[andrewbranch]

@typescript-bot test this

[typescript-bot]

Heya @andrewbranch, I've started to run the extended test suite on this PR at 9e34a81. You can monitor the build here. It should now contribute to this PR's status checks.

[andrewbranch]

@weswigham yup, looks like the RWC baselines went back to normal

[andrewbranch]

@weswigham after I merge this, do I just merge the baseline PR on mseng?

[andrewbranch]

@typescript-bot run dt

[typescript-bot]

Heya @andrewbranch, I've started to run the parallelized Definitely Typed test suite on this PR at 9e34a81. You can monitor the build here. It should now contribute to this PR's status checks.

[andrewbranch]

DT shows two instances of something like

1> No overload matches this call.
1>   Overload 1 of 2, '(props: Readonly<ProviderProps<AnyAction>>): Provider<AnyAction>', gave the following error.
1>     Property '[Symbol.observable]' is missing in type 'Store<IntlState>' but required in type 'Store<any, AnyAction>'.
1>   Overload 2 of 2, '(props: ProviderProps<AnyAction>, context?: any): Provider<AnyAction>', gave the following error.
1>     Type 'Store<IntlState>' is not assignable to type 'Store<any, AnyAction>'.

which coouuuld be related 😐

I can’t reproduce it locally, though 🤔

I don’t actually think this is related, as none of those types referenced are mapped types (thought they might be until looking at them). They’re just generic classes/interfaces. I’m running DT against master to see if the same ones show up.

[andrewbranch]

Same error occurs on current master.

Now trying with 32071 reverted.

[andrewbranch]

Yeah, #32370 indicates that the DT failures here are completely unrelated. This PR only improves things.

[sandersn]

I haven't figured out what causes the two DT errors on master AND can't reproduce them locally. I'm not sure what is going on.