public boolean contains(final Object key, final Object value) {
        return this.contains(key) && this.parameters.get(key).contains(value);
    }
Checks for existence of a key and value in a parameter set.

@param key the key to check
@param value the value to check
@return {@code true} if the key and value are present and {@code false} otherwise
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/Parameters.java