How to avoid rounding when data points are of the same value

[echarrod]

If I have data points that are the same value, e.g. with:

func Test_AsciiGraph(t *testing.T) {
	coverageGraphPoints := []float64{49.51, 49.51, 49.51}
	asciiGraph := fmt.Sprintf("\n\n%s", asciigraph.Plot(coverageGraphPoints,
		asciigraph.Precision(2),
		asciigraph.Caption("Code Coverage (excluding generated)")))
	fmt.Println(asciiGraph)
}

Then I get a rounded y axis value of 50.00, rather than 49.51:

=== RUN   Test_AsciiGraph


 50.00 ┼──
        Code Coverage (excluding generated)
--- PASS: Test_AsciiGraph (0.00s)
PASS

But if I have one value different, I get the graph that I expect (with coverageGraphPoints := []float64{49.51, 49.51, 49.52}:

=== RUN   Test_AsciiGraph


 49.52 ┤ ╭
 49.52 ┤ │
 49.51 ┼─╯
        Code Coverage (excluding generated)
--- PASS: Test_AsciiGraph (0.00s)
PASS

I do not want this rounding, and I instead want something like this:

=== RUN   Test_AsciiGraph


 49.51 ┼──
        Code Coverage (excluding generated)
--- PASS: Test_AsciiGraph (0.00s)
PASS

Was this a design decision to round when the values are the same? I see we are using a rounded "max2" at pkg/mod/github.com/guptarohit/[email protected]/asciigraph.go:82