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Conflic Resolution

The rules for conflicting keys are the same as in Figment

Strategy	Dictionaries	Arrays	All Others
`join`	Union, Recurse	Keep Existing	Keep Existing
`adjoin`	Union, Recurse	Concatenate	Keep Existing
`merge`	Union, Recurse	Use Incoming	Use Incoming
`admerge`	Union, Recurse	Concatenate	Use Incoming

opaque </>

pub opaque type Builder

</>

pub type ExtractError {
  Provider(msg: String)
  Decode(inner: List(decode.DecodeError))
}

</>

pub type Provider =
  fn() -> Result(List(#(String, value.Value)), String)

</>

pub fn adjoin(
  builder: Builder,
  provider: fn() -> Result(List(#(String, value.Value)), String),
) -> Builder

</>

pub fn admerge(
  builder: Builder,
  provider: fn() -> Result(List(#(String, value.Value)), String),
) -> Builder

</>

pub fn extract(
  builder: Builder,
  with decoder: decode.Decoder(a),
) -> Result(a, ExtractError)

</>

pub fn join(
  builder: Builder,
  provider: fn() -> Result(List(#(String, value.Value)), String),
) -> Builder

</>

pub fn merge(
  builder: Builder,
  provider: fn() -> Result(List(#(String, value.Value)), String),
) -> Builder

</>

pub fn new() -> Builder