@type t() :: %WplAi.AST.Requirements{
  age_range: {integer(), integer()} | nil,
  contraindications: [Contraindication.t()] | nil,
  equipment: [Equipment.t()] | nil,
  fitness_levels: [String.t()] | nil,
  meta: map(),
  time_commitment: TimeCommitment.t() | nil
}