Return index of undecodable element in dynamic.list DecodeError path

[Johannes]

stdlib/src/gleam/dynamic.gleam

Lines 320 to 329 in d8f046a

 pub fn list( 
   of decoder_type: fn(Dynamic) -> Result(inner, DecodeErrors), 
 ) -> Decoder(List(inner)) { 
   fn(dynamic) { 
     use list <- result.try(shallow_list(dynamic)) 
     list 
     |> list.try_map(decoder_type) 
     |> map_errors(push_path(_, "*")) 
   } 
 } 

I think it would be nice to return the index of the offending element instead of just "*"

I'm new to gleam, but I had a little play around trying to implement this and could open a pull request..

[Louis Pilfold]

Fab idea! Thank you