CBLMutableArrayFragment
@protocol CBLMutableArrayFragment <CBLArrayFragment>CBLMutableArrayFragment protocol provides subscript access to CBLMutableFragment objects by index.
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                  Subscript access to a CBLMutableFragment object by index. DeclarationObjective-C - (nullable CBLMutableFragment *)objectAtIndexedSubscript:(NSUInteger)index;ParametersindexThe index. Return ValueThe CBLMutableFragment object. 
 CBLMutableArrayFragment Protocol Reference
        CBLMutableArrayFragment Protocol Reference