Engineering Notation fails with small precision

[laborg]

If precision is set to 1 (or 2 for negative numbers) the wrong number is shown.

julia> Showoff.format_fixed_scientific(1e-7, 1, true)
"10×10⁻⁹"

Correct but looking strange :

julia> Showoff.format_fixed_scientific(1e-8, 1, true)
"10.×10⁻⁹"

With precision being large enough, negative values are technically correct, but differ from expectation:

julia> Showoff.format_fixed_scientific(1e-3, 3, true)
"1000.×10⁻⁶"  # should probably be 1.0×10⁻³"

julia> Showoff.format_fixed_scientific(1e-4, 3, true)
"100.0×10⁻⁶"

julia> Showoff.format_fixed_scientific(1e-5, 3, true)
"10.00×10⁻⁶"

julia> Showoff.format_fixed_scientific(1e-6, 3, true)
"1000.×10⁻⁹" # should probably be 1.0×10⁻⁶"