formatvalue shows a bug in beta9.10
when the first invisible fractional digit leads to a rounding towards the next integer, the part before the comma is wrong:
input out 2 digits out 1 digit
0.94 0.94 0.9 (correct)
0.96 0.96 0.0 (wrong; should be 1.0)
for negative values the same error can be observed…
hmm.