Should term and json be builtin module?

[khchen]

I notice that these two modules cost 73k, after remove them, the released binary size reduce from 373k to 300k on my machine.

For an embeddable scripting language, these functions should provide by the host language.
For standalone scripting tool, these functions can be added as dynamic library (.dll/.so).

Providing different dynamic library (linux, windows, x64, x86?) may be a problem.
But I think keep the core engine simple and small is more important.