{@code ConfigList} implements {@code java.util.List Like all {@link ConfigValue} subtypes, {@code ConfigList} is immutable. Thismakes it threadsafe and you never have to create "defensive copies." The mutator methods from {@link java.util.List} all throw{@link java.lang.UnsupportedOperationException}. The {@link ConfigValue#valueType} method on a list returns{@link ConfigValueType#LIST}. Do not implement {@code ConfigList}; it should only be implemented by the config library. Arbitrary implementations will not work because the library internals assume a specific concrete implementation. Also, this interface is likely to grow new methods over time, so third-party implementations will break.
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