> Please review this PR which improves the safety of equality checking for 
> DecimalFormatSymbols. As certain setters did not throw NPE, this allowed for 
> NPE in the equality method. This PR now updates the setters to throw NPE.
> 
> In addition to the NPEs, there is also a behavioral change that 
> `setInternationalCurrencySymbol` no longer sets currency to null if the 
> `currencyCode` is invalid. Instead, it simply does not update `currency`. 
> This must be done, because we do not want to allow nullable instance 
> variables post `initalizeCurrency`.

Justin Lu has updated the pull request incrementally with one additional commit 
since the last revision:

  reflect further review

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21315/files
  - new: https://git.openjdk.org/jdk/pull/21315/files/d0686b35..d31cb2eb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21315&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21315&range=03-04

  Stats: 25 lines in 2 files changed: 21 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/21315.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21315/head:pull/21315

PR: https://git.openjdk.org/jdk/pull/21315

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