And another unexpected behaviour:

data class Test(val name: Int)

you declare in meta :

receiving(Body.auto<Test>().toLens() to Test(3))

you call in a curl with

-d "{\"name\":5}"

it passes (it’s ok is just for reference of a correct call) but you call also with a bad keyname ex:

-d "{\"ne\":5}"

the call is valid. if name is a String this works as expected, fails if the key is spelled bad. I don’t use that value so don’t know if the created object would be valid. I’ll try to make a full test tomorrow evening too late for that right now.

This is down to the Jackson configuration for failing on unexpected keys.