A few methods in DefaultGroovyMethods don't utilize wildcards, for example,
the Map plus operator:
public static <K, V> Map<K, V> plus(Map<K, V> left, Map<K, V> right) { ... }
Which causes a compile error on the following, for example:
Map<String, Object> map = [:]
map + [hello: 'world']
A few other methods might suffer from this problem. Does anyone have
anything against changing them to support wildcards? eg: plus(Map<K, V>
left, Map<? extends K, ? extends V> right)
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