[Bug?] gen() without max_token parameter is limited to 16 tokens long by default.

[objnf-dev]

In functions wrapped by @sglang.function, sglang.gen() without max_token= parameter will generate less than 16 tokens by default, which is defined in SglFunction.run():

def run(
        self,
        *args,
        max_new_tokens: int = 16,
        ...
):

16 is too short for most situations and may produce unexpected results, such as incomplete JSON generations.

May be related: #211 #360

[merrymercy]

This is the default argument. Could you send a PR to make the default argument larger?