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Consistent nullability for StringUtils array/collection input parameters [SPR-17123] #21660
Spring Framework 5.1 provides a function named StringUtils.collectionToCommaDelimitedString which is defined here:
has argument type "Collection<?> coll".
However, it calls collectionToDelimitedString which accepts "Nullable" collection. I think collectionToCommaDelimitedString should be able to handle "Nullable" collection.
Affects: 5.1 RC1