Incorrect Web Mercator transforms with newest versions of proj4js

[geographika]

It looks like there was a change between proj4js 2.3.15 and 2.3.16 that has broken EPSG:4326 to EPSG:3857 transformations:

        var pt = new OpenLayers.Geometry.Point(-898447, 6907203);
        var epsg4326 = new OpenLayers.Projection("EPSG:4326");
        var epsg3857 = new OpenLayers.Projection("EPSG:3857");
        pt.transform(epsg3857, epsg4326);
        console.log(pt.x);
        console.log(pt.y);

        expect(Math.round(pt.x)).toEqual(-8);
        expect(Math.round(pt.y)).toEqual(53);

In 2.3.16 and later the results are:

        // proj4 - 2.3.16.js
        // -0.14086354683193542
        // 0.9178388206728668
        // console.log(JSON.stringify(proj4.defs["EPSG:4326"]))
        // { "title": "WGS 84 (long/lat)", "projName": "longlat", "ellps": "WGS84", "datumCode": "WGS84", "units": "degrees", "k0": 1, "axis": "enu" }
        // console.log(JSON.stringify(proj4.defs["EPSG:3857"]))
        // { "title": "WGS 84 / Pseudo-Mercator", "projName": "merc", "a": 6378137, "b": 6378137, "lat_ts": 0, "long0": 0, "x0": 0, "y0": 0, "k0": 1, "units": "m", "datumCode": "none", "no_defs": true, "axis": "enu" }

In 2.3.15 they are:

        // proj4-2.3.15
        // -8.070886720713318
        // 52.588290697820085
        // console.log(JSON.stringify(proj4.defs["EPSG:4326"]))
        // { "title": "WGS 84 (long/lat)", "projName": "longlat", "ellps": "WGS84", "datumCode": "WGS84", "units": "degrees", "a": 6378137, "rf": 298.257223563, "ellipseName": "WGS 84", "b": 6356752.314245179, "a2": 40680631590769, "b2": 40408299984661.445, "es": 0.006694379990141316, "e": 0.08181919084262149, "ep2": 0.006739496742276434, "k0": 1, "axis": "enu", "datum": { "datum_type": 4, "a": 6378137, "b": 6356752.314245179, "es": 0.006694379990141316, "ep2": 0.006739496742276434 } }
        // console.log(JSON.stringify(proj4.defs["EPSG:3857"]))
        // {"title":"WGS 84 / Pseudo-Mercator","projName":"merc","a":6378137,"b":6378137,"lat_ts":0,"long0":0,"x0":0,"y0":0,"k0":1,"units":"m","datumCode":"none","no_defs":true,"sphere":true,"a2":40680631590769,"b2":40680631590769,"es":0,"e":0,"ep2":0,"axis":"enu","datum":{"datum_type":5,"a":6378137,"b":6378137,"es":0,"ep2":0}}

However proj4js works fine independently of ol2:

        var toProj = proj4('EPSG:4326');
        var fromProj = proj4('EPSG:3857');
        var res = proj4(fromProj, toProj, [-898447, 6907203]);
        expect(Math.round(res[0])).toEqual(-8);
        expect(Math.round(res[1])).toEqual(53);