Zixuan James Li bb9e80d7a2 i18n: Deal with lazy strings more carefully. ...

This uses a more specific type `_StrPromise` to replace `Promise`
providing typing information for lazy translation strings.

In places where the callee evaluates the `_StrPromise` object in all
cases we simply force the evaluation with `str()`. This includes
`JsonableError` that ends up handled by the error handler middleware,
and `internal_send_stream_message` that depends on `check_stream_topic`,
requiring the `topic` to be evaluated anyway. In other siuations, the
callee is expected to be able to handle `StrPromise` explicitly.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

2022-08-29 10:52:45 -07:00

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