Double-to-string format using "G17" does not match .NET

[jwosty]

Description

Using the "G17" float format doesn't match .NET.

Repro code

let f (x: float) = printfn "%s" (x.ToString("G17"))
f 123.45
f 10_000.0
f 0.000222

Expected and actual results

.NET output:

123.45
10000
0.000222

Fable output:

123.45000000000000
10000.000000000000
0.00022200000000000000

It seems that .NET is just omitting the trailing zeros? Here are the docs, for reference: https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#GFormatString

As a workaround, I'm just using ToString without a format specifier and it seems to be working for my purposes for now. I was just needing a float format that could round-trip, and MS docs recommend you use "G17", but I don't seem to be having any issues with whatever the default is yet.

Related information

• Fable version: 3.6.3
• .NET version: 6.0.100
• Operating system: Windows 10.0.19043