add transformers to file helpers (#2922)

* fix undefined handling in INI

* beta.14

* Partial -> DeepPartial in action request

* boolean laziness kills

* beta.16

* misc fixes

* file transformers

* infer validator source argument

* simplify validator

* readd toml

* beta.17

* filter undefined instead of parse/stringify

* handle arrays of objects in filterUndefined

sdk/base/lib/actions/index.ts

@@ -54,7 +54,7 @@ type ActionRequestBase = {
 }
 type ActionRequestInput<T extends Action<T.ActionId, any, any>> = {
   kind: "partial"
-  value: Partial<GetActionInputType<T>>
+  value: T.DeepPartial<GetActionInputType<T>>
 }
 export type ActionRequestOptions<T extends Action<T.ActionId, any, any>> =
   ActionRequestBase &