Extensions
Scalar Functions
```sql
SELECT ST_AsWKB('POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))'::GEOMETRY)::BLOB;
----
\x01\x03\x00\x00\x00\x01\x00\x00\x00\x05...
```  
----  
#### ST_Boundary {#docs:extensions:spatial:functions::st_boundary}