def GTE(x=None, y=None):
if x is None and y is None:<EOL><INDENT>return {'<STR_LIT>': []}<EOL><DEDENT>return {'<STR_LIT>': [x, y]}<EOL>
Compares two values and returns:
    true when the first value is greater than or equivalent to the second value.
    false when the first value is less than the second value.
See https://docs.mongodb.com/manual/reference/operator/aggregation/gte/
for more details
:param x: first value or expression
:param y: second value or expression
:return: Aggregation operator