Originally, I was fully on board with the homogeneous array requirement but its recently started causing me pains.

Homogeneous arrays can come in the following forms

- Shallow, literal type (a list of lists, regardless of the nested lists contain)

- Full, literal type (a list of dicts of strings)

- Logical type

There are many times where a list is the best type for my data but I want to take advantage of logical types for easier configuration by my users.

Below is an example of what I mean by "homogeneous logical types":

`Cargo.toml` has you specify dependencies using a dict

  [dependencies]
  foo = { "version" = "1.0" }

but allows a short-cut syntax where a string value is assumed to be the version value in the above dict.

  [dependencies]
  foo = "1.0"

Generally this is done in Rust using Enums

  enum Dependency {
     Version(String),
     Specification(HashMap<String, String>),
  }