Use bare raise statement when reraising the exception that occured, and
remove unused exception variables. Also remove a pointless exception
handler in discord.opus.
Original code by zephyrkul.
This new parsing mode allows for backtracking in case of failure
when a typing.Union[..., NoneType] or a typing.Optional[...] is used.
This means that if a type would fail to parse, the view is undo'd to
a previous state, passing the default parameter to the callback, and
then continuing on the next parameter as if nothing had happened.
The previous usage of `typing.get_type_hints` caused issues as it would
incorrectly decide to convert annotations into their equivalent
`typing` form -- which is not what we want to happen here.
Due to some use-cases about how setting `Command.callback` work and
the amount of moving parts that have changed due to this patch, it is
probably better to refactor the way it is set so users can have this
use-case handled transparently for them.
This assumes that a Converter class raising non-CommandError
is a programmer error. Makes this type of error easier to
disambiguate from a generic BadArgument.
This is powered by a dict-like class for the people who want to opt-in
to the performance downgrade for usability for majority English
speaking users.
Since it is slower than the regular dict due to the excessive calls to
str.lower along with the possibilities of gotchas for other languages
outside of English, this is kept as False for the default case.
Previously, Context.command was not guaranteed to be the actual command
being checked if it can run. This could be troublesome when
implementing help commands or when using the default help command.
This new change allows at least for the guarantee that Context.command
to be technically correct in Command.can_run.
Context.reinvoke would be the new way to bypass checks and cooldowns.
However, with its addition comes a change in the invocation order of
checks, callbacks, and cooldowns. While previously cooldowns would
trigger after command argument parsing, the new behaviour parses
cooldowns before command argument parsing.
The implication of this change is that Context.args and Context.kwargs
will no longer be filled properly.
Along with this change comes with the removal of Converter.prepare and
adding two arguments to Converter.convert, the context and the argument.
I suppose an added benefit is that you don't have to do attribute
access since it's a local variable.
