Update TryParse methods to use nullable PreciseNumber

Changed the output parameter type of the TryParse methods in the PreciseNumber class from PreciseNumber to nullable PreciseNumber?. This allows the methods to return null on parsing failure, improving clarity in error handling.

Author: matt-edmondson

PreciseNumber/PreciseNumber.cs

@@ -760,15 +760,15 @@ public static bool TryParse(ReadOnlySpan<char> s, NumberStyles style, IFormatPro
 	}
 
 	/// <inheritdoc/>
-	public static bool TryParse([NotNullWhen(true)] string? s, NumberStyles style, IFormatProvider? provider, [MaybeNullWhen(false)][NotNullWhen(true)] out PreciseNumber result) =>
+	public static bool TryParse([NotNullWhen(true)] string? s, NumberStyles style, IFormatProvider? provider, [NotNullWhen(true)] out PreciseNumber? result) =>
 		TryParse(s.AsSpan(), style, provider, out result);
 
 	/// <inheritdoc/>
-	public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [MaybeNullWhen(false)][NotNullWhen(true)] out PreciseNumber result) =>
+	public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [NotNullWhen(true)] out PreciseNumber? result) =>
 		TryParse(s.AsSpan(), NumberStyles.Any, provider, out result);
 
 	/// <inheritdoc/>
-	public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [MaybeNullWhen(false)][NotNullWhen(true)] out PreciseNumber result) =>
+	public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [NotNullWhen(true)] out PreciseNumber? result) =>
 		TryParse(s, NumberStyles.Any, provider, out result);
 
 	/// <inheritdoc/>