Returns dramatically wrong results

[goerz]

julia> using Formatting
julia> Formatting.fmt(".1e", 0.0003)
"2.10e-04"

[Seelengrab]

For comparison, the Printf stdlib returns the correct result:

julia> using Printf

julia> @sprintf "%.1e" 0.0003
"3.0e-04"

[danielwe]

Another example:

julia> using Formatting
julia> Formatting.fmt(".1e", 0.0006)
"5.10e-04"

I've only seen this for these two particular numbers. Same error with 3e-8 and 6e-8. Probably an unfortunate interaction between the truncation algorithm and certain inexact floating point representations.