A segment endpoint is not ST_DWithin the segment (0 tolerance)

[strk]

See this crazyness here:

strk=# select ST_DWithin(g, st_endpoint(g), 0), 
              ST_DWithin(g, st_startpoint(g), 0)
from ( select 
'LINESTRING(-0.2 0.4,-1e-08 0.4)'::geometry as g 
) f;
 st_dwithin | st_dwithin 
------------+------------
 f          | t
(1 row)

[strk]

Bug in liblwgeom, no bounding box caches involved: lwgeom_mindistance2d_tolerance affected

[strk]

r<0 and r>1 are checked, but not r==0 and r==1, which mean p==A and p==B in the distance(p, AB) operation… Working on a testcase.

[strk]

Fixed in r8790