New TimeSpan.From*() overloads that take integers
New TimeSpan.From*() overloads that accept integers were introduced in .NET 9. This change can cause ambiguity for the F# compiler and result in compile-time errors.
Previous behavior
Previously, there was a single overload for each TimeSpan.From*() method, namely:
- FromDays(Double)
- FromHours(Double)
- FromMicroseconds(Double)
- FromMilliseconds(Double)
- FromMinutes(Double)
- FromSeconds(Double)
New behavior
Starting in .NET 9, new overloads have been added that accept integer arguments. Calling a method such as TimeSpan.FromMinutes(20) in F# code results in a compile-time error:
error FS0041: A unique overload for method 'FromMinutes' could not be determined based on type information prior to this program point. A type annotation may be needed. Known type of argument: intCandidates: - TimeSpan.FromMinutes(minutes: int64) : TimeSpan - TimeSpan.FromMinutes(minutes: int64, ?seconds: int64, ?milliseconds: int64, ?microseconds: int64) : TimeSpan - TimeSpan.FromMinutes(value: float) : TimeSpan
Version introduced
.NET 9 Preview 3
Type of breaking change
This change can affect source compatibility for F# code.
Reason for change
The pre-existing overloads accepted a Double argument. However, Double is a binary-based, floating-point format and thus has natural imprecision that can introduce error. This behavior has led to user confusion and bugs in the API surface. It's also one of the less efficient ways to represent this data. To produce the intended behavior, new overloads were introduced that allow users to pass in integers.
Recommended action
If this change affects your F# code, specify the type of argument so the compiler selects the appropriate overload.
