[ruby-core:73955] [Ruby trunk Bug#12105] JSON.pretty_generate throws a TypeError when there is a BigDecimal object as a value

Issue #12105 has been reported by Adnan Abdulally.

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Bug #12105: JSON.pretty_generate throws a TypeError when there is a BigDecimal object as a value
https://bugs.ruby-lang.org/issues/12105

* Author: Adnan Abdulally
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.3.0
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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As the title states, JSON.pretty_generate throws a TypeError when there is a BigDecimal object as a value. This used to work in ruby 2.0 before upgrading in development. I havent tested to see how far back in ruby versions the error goes. 

Example console log of how to replicate:

`
[17] pry(main)> hash = {"x" => BigDecimal('50.0')}
=> {"x"=>#<BigDecimal:1befe50,'0.5E2',9(18)>}
[18] pry(main)> JSON.pretty_generate(hash)
TypeError: wrong argument type Float (expected String)
from /home/adnan/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/core_ext/object/json.rb:34:in `to_json'
`



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