Plots: precision of numeric labels, default `xformatter`, or . .

Specific Domains Visualization
1

Basically I want to adjust the number of the significant digits in the numeric labels on the x axis:

using Plots
using StrFormat
x = 0:1e5:8e6
y = rand(Float64, length(x))
plot(x,y) # -> 2.0 × 10^6
plot(x,y; xformatter=(x -> f"\%.0e(x)")) # -> 2e+06

By default, the plot command plots beautiful numeric labels often with one extra 0 than necessary; for example, “2.0”, “4.0”, “6.0”, . . . I want them to be “2”, “4”, “6”, . . .

  1. Is there a Plot attribute for that? I haven’t found one.
  2. What’s the default xformatter? If it can be used by the user and if there is an adjustable parameter to it, the user can write something like xformatter=(x -> defaultformatter(x, precision=1)) ?
  3. Is there a string formatter that produces labels like “2 × 10^6” with a “real” superscript “6” ? (One can write such a function that produces a LaTeX string but that would be re-inventing a poorer wheel.)

Apart from this question, I’d like to get hold of the default formatter anyway because that would be useful with annotate!().