Polar_Stereographic latitude_of_origin should be parsed as lat_ts

Proj4JS currently gives incorrect projection results for Polar Stereographic projections such as EPSG:3995 and EPSG:3031 when using WKT for the projection string. It works correctly for Proj4 strings. For example, EPSG:3031 (Antarctic Polar Stereographic)...

+proj=stere +lat_0=-90 +lat_ts=-71 +lon_0=0 +k=1 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs

... as a WKT string is...

PROJCS["WGS 84 / Antarctic Polar Stereographic",
    GEOGCS["WGS 84",
        DATUM["WGS_1984",
            SPHEROID["WGS 84",6378137,298.257223563,
                AUTHORITY["EPSG","7030"]],
            AUTHORITY["EPSG","6326"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.01745329251994328,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4326"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    PROJECTION["Polar_Stereographic"],
    PARAMETER["latitude_of_origin",-71],
    PARAMETER["central_meridian",0],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    AUTHORITY["EPSG","3031"],
    AXIS["Easting",UNKNOWN],
    AXIS["Northing",UNKNOWN]]

When parsing the WKT string, WKT-Parser gives this result:

{
    "type": "PROJCS",
    "name": "WGS 84 / Antarctic Polar Stereographic",
    "GEOGCS": {
        "name": "WGS 84",
        "DATUM": {
            "name": "WGS_1984",
            "SPHEROID": {
                "name": "WGS 84",
                "a": 6378137,
                "rf": 298.257223563,
                "AUTHORITY": {
                    "EPSG": "7030"
                }
            },
            "AUTHORITY": {
                "EPSG": "6326"
            }
        },
        "PRIMEM": {
            "name": "greenwich",
            "convert": 0,
            "AUTHORITY": {
                "EPSG": "8901"
            }
        },
        "UNIT": {
            "name": "degree",
            "convert": 0.01745329251994328,
            "AUTHORITY": {
                "EPSG": "9122"
            }
        },
        "AUTHORITY": {
            "EPSG": "4326"
        }
    },
    "UNIT": {
        "name": "metre",
        "convert": 1,
        "AUTHORITY": {
            "EPSG": "9001"
        }
    },
    "PROJECTION": "Polar_Stereographic",
    "latitude_of_origin": -71,
    "central_meridian": 0,
    "scale_factor": 1,
    "false_easting": 0,
    "false_northing": 0,
    "AUTHORITY": {
        "EPSG": "3031"
    },
    "AXIS": [
        [
            "Easting",
            "UNKNOWN"
        ],
        [
            "Northing",
            "UNKNOWN"
        ]
    ],
    "projName": "Polar_Stereographic",
    "axis": "enu",
    "units": "meter",
    "to_meter": 1,
    "datumCode": "wgs84",
    "ellps": "WGS 84",
    "a": 6378137,
    "rf": 298.257223563,
    "k0": 1,
    "x0": 0,
    "y0": 0,
    "long0": 0,
    "lat0": -1.239183768915974,
    "srsCode": "WGS 84 / Antarctic Polar Stereographic"
}

-1.239183768915974 radians = -71 degrees. WKT-Parser is parsing the latitude_of_origin value as lat0, while proj4js's stere projection expects it to be passed as lat_ts.

proj4js / wkt-parser

Polar_Stereographic latitude_of_origin should be parsed as lat_ts #25