Open Radar

 
Xcode should check consistency of localized format strings

Steps to Reproduce:
Add some localizable strings to your project
Get localized variants back

Expected Results:
If there are typos in localized strings that break the format strings so that they would be interpreted with a different number of format specifiers, Xcode should produce an error
If two different localization use different types for the same position (%1$s in one locale and %1$@ in another) Xcode should produce an error
If there are multiple format specifiers, the localized variants should all have positional specifiers (since some locales may reverse the order)

Actual Results:
Xcode blithely accepts localized strings pairs that may produce gibberish or may cause application crashes

Regression:
N/A

Notes:
Our basic implementation of this is at https://github.com/omnigroup/ValidateLocalizedFormatStrings, but a built-in Xcode version could be more complete and better integrated