Currently, there is an existing bug in monetize v1.13.0 introduced by #167 that attempted to implement additional logic for currency parsing discussed in #153.

Example of the bug:

• Expected:

"RM100".to_money    # #<Money fractional:10000 currency:MYR>
Monetize.parse("RM100")   # #<Money fractional:10000 currency:MYR>
Monetize.parse("100 RM")   # #<Money fractional:10000 currency:MYR>

• Reality:

[1] pry(main)> Monetize.parse("RM100")
=> #<Money fractional:10000 currency:USD>

[8] pry(main)> "RM100".to_money
=> #<Money fractional:10000 currency:USD>

[14] pry(main)> Monetize.parse("100 RM")
=> #<Money fractional:10000 currency:USD>

This PR aims to:

• Fix that bug.
• Implement the additional currency parsing logic in Version 1.11.0 broke parsing for Malaysian ringgit when using the symbol 'RM' #153.
• Improve parsing logic in general by validating parsed currency input against Money::Currency.all.map(&:iso_code).
• Update spec/monetize_spec.rb to accommodate for the aforementioned changes.