Unexpected behavior with fast_counter about exometer HOT 3 CLOSED

1> exometer:start().
08:42:43.365 [info] Application lager started on node nonode@nohost
08:42:43.390 [info] Starting reporters with []
ok
08:42:43.390 [info] Application exometer_core started on node nonode@nohost
2> exometer:new([fc], fast_counter, [{function,{c,pwd}}]).
ok
3> exometer:get_value([fc]).
{ok,[{value,0},{ms_since_reset,9983}]}
4> pwd().
/Users/uwiger/FL/git/exometer_core
ok
5> exometer:get_value([fc]).
{ok,[{value,1},{ms_since_reset,14679}]}
6> pwd().
/Users/uwiger/FL/git/exometer_core
ok
7> exometer:get_value([fc]).
{ok,[{value,2},{ms_since_reset,21111}]}

1> exometer:start().
09:01:12.476 [info] Application lager started on node nonode@nohost
09:01:12.510 [info] Starting reporters with []
ok
09:01:12.510 [info] Application exometer_core started on node nonode@nohost
2> dbg:tracer(), dbg:tp(c,pwd,x), dbg:p(all,[c]).
{ok,[{matched,nonode@nohost,55}]}
3> pwd().
(<0.32.0>) call c:pwd()
/Users/uwiger/FL/git/exometer_core
(<0.32.0>) returned from c:pwd/0 -> ok
ok
4> exometer:new([fc],fast_counter,[{function,{c,pwd}}]).
ok
5> pwd().                                               
/Users/uwiger/FL/git/exometer_core
ok