static <R,E extends Exception> IntFunction<R> | 
IntFunctionWithException.ignored(IntFunctionWithException<R,E> function) | 
 Converts a IntFunctionWithException to a lifted IntFunction
 returning null in case of exception. 
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static <R,E extends Exception> IntFunction<R> | 
IntFunctionWithException.ignored(IntFunctionWithException<R,E> function,
       R defaultValue) | 
 Converts a IntFunctionWithException to a lifted IntFunction
 returning a default value in case of exception. 
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static <R,E extends Exception> IntFunction<Optional<R>> | 
IntFunctionWithException.lifted(IntFunctionWithException<R,E> function) | 
 Converts a IntFunctionWithException to a lifted IntFunction
 using Optional as return value. 
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static <R,E extends Exception> IntFunction<CompletionStage<R>> | 
IntFunctionWithException.staged(IntFunctionWithException<R,E> function) | 
 Convert this IntFunctionWithException to a lifted IntFunction
 returning CompletionStage as return value. 
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static <R,E extends Exception> IntFunction<R> | 
IntFunctionWithException.unchecked(IntFunctionWithException<R,E> function) | 
 Converts a IntFunctionWithException to a IntFunction that
 wraps exception to RuntimeException. 
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static <R,E extends Exception> IntFunction<R> | 
IntFunctionWithException.unchecked(IntFunctionWithException<R,E> function,
         Function<Exception,RuntimeException> exceptionMapper) | 
 Converts a IntFunctionWithException to a IntFunction that
 wraps exception to RuntimeException by using the provided mapping
 function. 
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