"Servers may validate the value (eg. to forbid spaces, as they make it harder
to use the key in JOIN messages). If the value is invalid, they SHOULD
return [ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696).
However, clients MUST be able to handle any of the following:
[ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696)
[ERR_INVALIDKEY](#errinvalidkey-525)
MODE echoed with a different key (eg. truncated or stripped of invalid
characters)
the key changed ignored, and no MODE echoed if no other mode change
was valid.
"Servers may validate the value (eg. to forbid spaces, as they make it harder
to use the key in JOIN messages). If the value is invalid, they SHOULD
return [ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696).
However, clients MUST be able to handle any of the following:
[ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696)
[ERR_INVALIDKEY](#errinvalidkey-525)
MODE echoed with a different key (eg. truncated or stripped of invalid
characters)
the key changed ignored, and no MODE echoed if no other mode change
was valid.
"Servers may validate the value (eg. to forbid spaces, as they make it harder
to use the key in JOIN messages). If the value is invalid, they SHOULD
return [ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696).
However, clients MUST be able to handle any of the following:
[ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696)
[ERR_INVALIDKEY](#errinvalidkey-525)
MODE echoed with a different key (eg. truncated or stripped of invalid
characters)
the key changed ignored, and no MODE echoed if no other mode change
was valid.
"Servers may validate the value (eg. to forbid spaces, as they make it harder
to use the key in JOIN messages). If the value is invalid, they SHOULD
return [ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696).
However, clients MUST be able to handle any of the following:
[ERR_INVALIDMODEPARAM](#errinvalidmodeparam-696)
[ERR_INVALIDKEY](#errinvalidkey-525)
MODE echoed with a different key (eg. truncated or stripped of invalid
characters)
the key changed ignored, and no MODE echoed if no other mode change
was valid.