Plan

Mandatory

Preserve annotations in generated classes
import other converters
- create an instance
- static functions could be used in case of generating extension funcitons

Nice to have

validations:
- function has return type
allow mutations using setters? (allow Unit return type?)
~~Generate extension functions? Companion objects?~~
- ~~scan for annotated variables (just to avoid using interfaces)~~ @Mapping lateinit var toEmployee: Person.() -> Employee
- @Isomorphism generate extension functions in two directions

Something to think of

Add errors to rendered file as comments?
Log error (recommendations) if not all properties mapped
Use setters if there is no value in constructor (Java?)
Collection conversions:
- list-set
- Support Sets element mappings
  - against: if projection function is surjective, result set will lose elements
  - introduce annotation @Injective?
rename @Target to @DefaultSource?