value    %.1f     %.2f     exact binary value     BigDecimal(HALF_EVEN,2)
0.125    0.1      0.13     0.125                  0.12
0.25     0.3      0.25     0.25                   0.25
0.35     0.4      0.35     0.34999999999999997779 0.35
2.675    2.7      2.68     2.67499999999999982236 2.67
1.005    1.0      1.01     1.00499999999999989341 1.00
0.5      0.5      0.50     0.5                    0.50
1.5      1.5      1.50     1.5                    1.50
2.5      2.5      2.50     2.5                    2.50

== %.0f on halves: HALF_UP, away from zero ==
1 2 3 -3

== same number, three routes: %f rounds what it is given ==
double 2.675                  -> 2.68
new BigDecimal("2.675")       -> 2.68
new BigDecimal(2.675)         -> 2.67