Add validate input option

[rom1504]

Can be implemented by having a validate function for each datatype

useful to debug calls to write

should be optional to avoid perf issues

examples:

• i8 : check whether input is between -128 and 127
• container : check all fields are present and no additional, check all subtypes

[Saiv46]

i8 : check whether input is between -128 and 127

Btw, all numeric types (except u64) already do validate input.

Maybe add PROTODEF_DEBUG environment variable for interpreter?

[loveGhb]

Hi, how can I fix this for myself? What should be checked and where?

RangeError [ERR_OUT_OF_RANGE]: Write error for undefined : The value of "value" is out of range. It must be >= -128 and <= 127. Received 129