Issue #12718 has been reported by jonathan rochkind.

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Bug #12718: BigDecimal() should raise on invalid input, consistent with Integer() and Float()
https://bugs.ruby-lang.org/issues/12718

* Author: jonathan rochkind
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Integer("2") # => 2
Integer("invalid") # raises ArgumentError: invalid value for Integer()

Float("2.0")  # => 2.0
Float("invalid") # raises ArgumentError: invalid value for Float()

BUT

BigDecimal("2.2") # => #<BigDecimal:7fb9ab1a9d40,'0.22E1',18(18)>
BigDecimal("invalid") # => #<BigDecimal:7fb9ab1b28c8,'0.0',9(9)>

I think BigDecimal("invalid") should raise rather than returning a BigDecimal representing `0`, to be consistent with Integer() and Float(), and to give you access to a string conversion that raises, which I don't think exists in stdlib at present. 

If you want conversion of a string to a BigDecimal that returns 0 rather than raising on bad input, you have String#to_d in `bigdecimal/util`.  That's consistent with String#to_f and #to_i as well. But there is currently no way to do a conversion that raises, BigDecimal() is inconsistent with Float() and Integer()



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