ChristopherSchultz commented on issue #269: Use parameterized collection constructors where possible URL: https://github.com/apache/tomcat/pull/269#issuecomment-611038366 Many of these instances are to protect private collections from being modified. For example, in `ServletSecurityElement.getHttpMethodConstraints()`, a new collection is being returned to avoid having the internal collection modified. Would it be safe-enough to return e.g. `Collections.unmodifiableSet(methodConstraints.values())` from that method, or is that too dangerous, as the "unmodifiable" collection includes a reference to the actual, potentially modifiable collection?
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