turf.within() fails but turf.inside() is successful - turfjs

Question

I am trying to use turf.js to return points within a polygon, but turf.within() generates an empty feature list even for points I know to be within a polygon - turf.inside() returns true for the same points and polygon. I provide an example below. I can successfully run the example at turf.within() and am not sure what it is about my geometry that is the problem.
<script type="text/javascript" src="https://npmcdn.com/#turf/turf/turf.min.js"></script>
....
var thePoint = [-118.049551, 33.866965]
var test = {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": thePoint
}
}, {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": thePoint
}
}
]
};
var cerrito = { "type": "Feature", "properties": { "GEO_ID": "1600000US0612552", "STATE": "06", "PLACE": "12552", "NAME": "Cerritos", "LSAD": "city", "CENSUSAREA": 8.725, "Shape_STAr": 246572616.215, "Shape_STLe": 118080.76087 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ -118.028887999836968, 33.882629000032836 ], [ -118.028681155924062, 33.873316057140322 ], [ -118.028772420533898, 33.873315497179512 ], [ -118.028772240680681, 33.873285861714471 ], [ -118.028761755934283, 33.872110544548683 ], [ -118.028717388339928, 33.866241889545748 ], [ -118.028792999919617, 33.866240999737094 ], [ -118.035119980483032, 33.866020314132811 ], [ -118.035591866241305, 33.866016576824734 ], [ -118.035818357122793, 33.866015383719059 ], [ -118.035983055259194, 33.866014509762415 ], [ -118.036147752309518, 33.8660136310734 ], [ -118.036148847050185, 33.866013630744973 ], [ -118.037598000415159, 33.866012999764315 ], [ -118.037597881676277, 33.866006075268416 ], [ -118.037624048408333, 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var cerritoPolygon = turf.polygon(cerrito.geometry.coordinates[0]) //turn cerrito coordinates into polygon
var cerritoFeatureCollection = turf.featureCollection(cerrito) //create a feature collection
var ptsWithin = turf.within(test, cerritoFeatureCollection); //see if test points are within the cerrito featureCollection
var pt = turf.point(thePoint);
var isInside = turf.inside(pt, cerritoPolygon);
console.log(ptsWithin)//returns a featureCollection with an empty features array
console.log(isInside)//returns true - thePoint is in the cerrito polygon