You're seeing just the function exclusive_minimum, go back to PhoenixSwagger.Schema module for more information.
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exclusive_minimum(model, exclusive?)

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Boolean indicating that value for minimum is excluded from the valid range.

When true: x > minimum, when false: x => minimum.


iex> alias PhoenixSwagger.Schema
...> %Schema{type: :number}
...> |> Schema.minimum(16)
...> |> Schema.exclusive_minimum(true)
  type: :number,
  minimum: 16,
  exclusiveMinimum: true