sql - pgr_createTopology says no function matches -

i know attributes have in order checked. manual says renamed in version 2.0 can't see difference.

sql error: function pgr_createtopology(unknown, numeric, unknown, unknown) not exist line 1: select pgr_createtopology('edges', 0.000001, 'way', 'osm_id'...                ^ hint:  no function matches given name , argument types. might need add explicit type casts. 

in statement:

select pgr_createtopology('edges', 0.000001, 'way', 'osm_id') 

adding explicit type casts parameters literals fixes problem

select pgr_createtopology('edges'::text, 0.000001, 'way'::text, 'osm_id'::text)