DarkMatter.Decimals.Conversion.decimal_round_ok

You're seeing just the function decimal_round_ok, go back to DarkMatter.Decimals.Conversion module for more information.
Link to this function

decimal_round_ok(amount, list)

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Specs

decimal_round_ok(any(), round_options()) :: {:ok, Decimal.t()} | :error

((n + (factor/2)) / factor) * factor