in src/main/java/org/apache/sling/scripting/sightly/render/RenderUnit.java [176:185]
public Object remove(Object key) {
if (!(key instanceof String)) {
throw new ClassCastException("key should be a String");
}
String originalKey = keyMappings.remove(((String) key).toLowerCase());
if (originalKey != null) {
return wrapped.remove(originalKey);
}
return null;
}