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number_to_currency(1234567890.50)                    # => $1,234,567,890.50
number_to_currency(1234567890.506)                   # => $1,234,567,890.51
number_to_currency(1234567890.506, precision: 3)     # => $1,234,567,890.506
number_to_currency(1234567890.506, locale: :fr)      # => 1 234 567 890,51 €
number_to_currency("123a456")                        # => $123a456

number_to_currency("123a456", raise: true)           # => InvalidNumberError

number_to_currency(-1234567890.50, negative_format: "(%u%n)")
# => ($1,234,567,890.50)
number_to_currency(1234567890.50, unit: "R$", separator: ",", delimiter: "")
# => R$1234567890,50
number_to_currency(1234567890.50, unit: "R$", separator: ",", delimiter: "", format: "%n %u")
# => 1234567890,50 R$