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Where are the WKT types CIRCULARSTRING, COMPOUNDCURVE etc actually defined?

I'm trying to find the actual definition of the curve types supported by PostGIS in WKT. PostGIS's documentation refers to the " SQL Multimedia Applications Spatial specification": The SQL ...
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JavaScript libraries for converting curves to/from EWKT and GeoJSON

Are there any JavaScript libraries that can convert EWKT/WKT curve geometries (as defined by PostGIS) to GeoJSON or similar? That is, libraries that generate a linear approximation of a CIRCULARSTRING ...