feat: let default nomalizer be more general

[jjangga0214]

Hi.

Currently, the default normalizer covers quite narrow cases only.
So, if argument(s) is(are) object(s) (including array), users have to specify a normalizer.

However, in fact, many more objects, which current default normalizer cannot cover, can be serialized without extra configuration.
For example, we can use https://github.com/yahoo/serialize-javascript for new default nomalizer.
(This would be a better default choice compared to JSON.stringify or so.)

Sane default options would be convenient for users.

How do you think?

Thanks.

[medikoo]

@jjangga0214 thanks for openning that. Any change in defaults is technically a breaking change.

I'm open to that. Still have you checked the proposal for v1: #73 ?
It doesn't propose to serialize to JSON by default, but it's scheduled to be behind straightforward serialize: true option