gistfile1.txt

F# 7

1. For FSharp.Core

   - assembly size reduced by 1MB
   - resource blob FSharpMetadata containing zipped optdata + sigdata  320KB
   -   (name of this data)
   - F# 7 compiler reads this blob
   - extra file FSharp.Core.sigdata in nuget containing unzipped sigdata for consumption by F# 6 compilers
   - extra file FSharp.Core.optdata in nuget containing unzipped optdata for consumption by F# 6 compilers

2. Add option "/zipmetadata". 

   - <ZipMetadata> is in new project files by default in F# 7 compilations.  
   - Only adds FSharpMetadata blob.
   - Assemblies are unusbale by F# 6 compilers
   - If you want assemblies usable by F# then remove ZipMetadata