Cannot decode geobuf from PostGIS

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I have a geobuf string from PostGIS that look like this:
`CgVjb3VudCLTAwoeChQIAhoQzvjgCNKYhzbmC/4F1jTIIGoCGAtyAgAAChoKEAgCGgyKueEImL+H
NvIjlBZqAhgLcgIAAAomChwIAhoY/NzhCKzVhzbSEIQKygfsA5oKggS6C9gDagIYC3ICAAAKHgoU
CAIaEOyK4gj26oc2/ArSApAMiAJqAhgLcgIAAAoaChAIAhoM+KHiCNDvhzbsWKIKagIYC3ICAAAK
JgocCAIaGOT64gjy+Yc23gnkAd4IyALKB/ICkAfKA2oCGAtyAgAACiIKGAgCGhT6m+MI2oSINvIG
ngSgF6QQvgykCmoCGAtyAgAACiAKFggCGhLO+OAI0piHNj7jASGNAZcopzlqAhgLcgIAAAoaChAI
AhoM0tDgCLjchjaXDs0TagIYC3ICAAAKGgoQCAIaDLrC4AjqyIY28xHdGWoCGAtyAgAACkEKNwgC
GjPGsOAIjK+GNtsC2wZBtQQTwQSWAZMFlgKpBMgJuQ3sAbMD7AGVBhW/A2vtA3+dA68GjRBqAhgL
cgIAAAoZCg8IAhoLrrXgCJzkhTZs6wFqAhgLcgIAAAotCiMIAhofmrbgCLDihTaWAqUC/BXVENIZ
wwzKBMcBqAMnxAXQAWoCGA1yAgAA`

When I decode this I get an error:
Uncaught (in promise) Error: Unimplemented type: 4
at o.skip (index.js:211:20)

I'm using dash-leaflet to parse the geobuf:
https://github.com/thedirtyfew/dash-leaflet/blob/master/src/lib/utils.js#L54

As a temporary solution I instead use pygeobuf to decode the string, which works perfectly fine:
https://github.com/pygeobuf/pygeobuf

If I decode with pygeobuf and encode back, I can decode the string with geobuf.js/dash-leaflet. I also notice there are fewer newlines in the string after this:
`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`

I think there must be a problem with the js decoder, since the python decoder works fine with PostGIS.

For context this is the GeoJson:
`{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1827584,56.6820249],[9.1835135,56.6824076],[9.1868848,56.684492]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1868848,56.684492],[9.1891818,56.6859091]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1891818,56.6859091],[9.1902469,56.6865514],[9.1907314,56.6867975],[9.1913843,56.6870543],[9.1921178,56.6872902]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1921178,56.6872902],[9.1928196,56.6874594],[9.1935952,56.6875912]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1935952,56.6875912],[9.1992813,56.6882486]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1992813,56.6882486],[9.1999049,56.6883627],[9.2004634,56.6885262],[9.2009485,56.688712],[9.2014049,56.6889408]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.2014049,56.6889408],[9.2018453,56.6892112],[9.2033332,56.6902532],[9.2041326,56.6909117]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1827584,56.6820249],[9.1827898,56.6819101],[9.1827726,56.6818394],[9.1802005,56.6781717]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1802005,56.6781717],[9.1792926,56.676917]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1792926,56.676917],[9.1781464,56.6752693]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1781464,56.6752693],[9.1779721,56.6748395],[9.1779399,56.6745565],[9.1779292,56.6742677],[9.1780043,56.6739376],[9.1781437,56.6736606],[9.1787553,56.6728],[9.1788733,56.6725819],[9.1789913,56.6721869],[9.1789806,56.6719629],[9.178927,56.6717153],[9.1788626,56.671509],[9.1784549,56.6704774]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1784549,56.6704774],[9.1785085,56.6703595]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1785085,56.6703595],[9.178648,56.6702121],[9.1800535,56.6691451],[9.181695,56.6683434],[9.1819873,56.6682431],[9.1821992,56.668224],[9.1825533,56.6683271]]},"properties":{"count":"13"}}]}`

Start at index.js:211, where skip reports “Unimplemented type: 4,” and inspect the decoding path used by dash-leaflet in src/lib/utils.js. Compare the original PostGIS geobuf with pygeobuf’s round-trip output; done means the JavaScript decoder accepts the original string without that error.

Written by the indexing model from the issue text.