How to use the mercantile.truncate_lnglat function in mercantile

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def test_truncate_lng_under():
    assert mercantile.truncate_lnglat(-181, 0) == (-180, 0)

def test_truncate_lng_over():
    assert mercantile.truncate_lnglat(181, 0) == (180, 0)

def test_truncate_lat_under():
    assert mercantile.truncate_lnglat(0, -91) == (0, -90)

def test_truncate_lat_over():
    assert mercantile.truncate_lnglat(0, 91) == (0, 90)