$ hfst-fst2txt bar.hfst
0	1	a	b	-5.000000
1	1	b	b	-1.000000
1	0.000000

$ hfst-minimize bar.hfst | hfst-fst2txt
0	1	a	b	-16777220.000000
1	1	b	b	0.000000
1	16777216.000000