Preconditions with non-interger decimals are broken

[grayed]

Here's an example. I've put a lot of Requires() to demonstrate that the issue is somehow related with decimal having fractional part, and also with placement in argument list.

using System;
using System.Diagnostics.Contracts;

namespace FodyTest
{
    class Worker
    {
        public static decimal CalcSmth(decimal foo, decimal bar, decimal buz, decimal qwe)
        {
            Contract.Requires(foo > bar);
            Contract.Requires(foo > buz);
            Contract.Requires(foo < qwe);
            Contract.Requires(bar < foo);
            Contract.Requires(bar < buz);
            Contract.Requires(bar < qwe);
            Contract.Requires(buz < foo);
            Contract.Requires(buz > bar);
            Contract.Requires(buz < qwe);
            Contract.Requires(qwe > foo);
            Contract.Requires(qwe > bar);
            Contract.Requires(qwe > buz);
            return (foo + bar + buz + qwe) / 2;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine($"Worker.CalcSmth() returned {Worker.CalcSmth(12.0M, 1.5M, 2, 35.1M)}");
        }
    }
}

As you can see, no contracts are actually broken, but cccheck doesn't agree:

1>  CodeContracts: Task manager is unavailable (unable to run in background).
1>  CodeContracts: FodyTest: Run static contract analysis.
1>  CodeContracts: FodyTest: Time spent connecting to the cache: 00:00:03.5008095
1>  CodeContracts: FodyTest: Cache used: (LocalDb)\v11.0
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: Suggested requires: This precondition is redundant: Consider removing it
1>  CodeContracts: FodyTest: Validated: 77.8 %
1>  CodeContracts: FodyTest: Checked 18 assertions: 14 correct 4 unknown
1>  CodeContracts: FodyTest: Contract density: 2.68
1>  CodeContracts: FodyTest: Total methods analyzed 4
1>  CodeContracts: FodyTest: Methods analyzed with a faster abstract domain 0
1>  CodeContracts: FodyTest: Method analyses read from the cache 4
1>  CodeContracts: FodyTest: Methods not found in the cache 0
1>  CodeContracts: FodyTest: Methods with 0 warnings 3
1>  CodeContracts: FodyTest: Total time 1.981sec. 495ms/method
1>  CodeContracts: FodyTest: Retained 0 preconditions after filtering
1>  CodeContracts: FodyTest: Inferred 0 object invariants
1>  CodeContracts: FodyTest: Retained 0 object invariants after filtering
1>  CodeContracts: FodyTest: Detected 0 code fixes
1>  CodeContracts: FodyTest: Proof obligations with a code fix: 0
1>C:\Users\user\source\repos\FodyTest\Program.cs(30,13,30,103): warning : CodeContracts: requires unproven: foo > bar
1>C:\Users\user\source\repos\FodyTest\Program.cs(10,13,10,42): warning : CodeContracts: location related to previous warning
1>C:\Users\user\source\repos\FodyTest\Program.cs(30,13,30,103): warning : CodeContracts: requires unproven: foo > buz
1>C:\Users\user\source\repos\FodyTest\Program.cs(11,13,11,42): warning : CodeContracts: location related to previous warning
1>C:\Users\user\source\repos\FodyTest\Program.cs(30,13,30,103): warning : CodeContracts: requires unproven: foo < qwe
1>C:\Users\user\source\repos\FodyTest\Program.cs(12,13,12,42): warning : CodeContracts: location related to previous warning
1>C:\Users\user\source\repos\FodyTest\Program.cs(30,13,30,103): warning : CodeContracts: requires unproven: bar < buz
1>C:\Users\user\source\repos\FodyTest\Program.cs(14,13,14,42): warning : CodeContracts: location related to previous warning
1>  CodeContracts: Checked 18 assertions: 14 correct 4 unknown
1>  CodeContracts: FodyTest: 
1>  CodeContracts: FodyTest: Static contract analysis done.
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

Visual Studio 2019 16.3.10
.NET Framework 4.8.03752
Installed NuGet packages System.Diagnostic.Contracts 4.3.0 and CodeContracts.MSBuild.v2 1.13.0.