Description

System.Convert.ChangeType(...) cannot convert positive or negative infinity to float or double in .NET 6/7/8.

Reproduction Steps

• GitHub repo: https://github.com/Bartleby2718/convert-changetype-infinity
• AppVeyor run: https://ci.appveyor.com/project/Bartleby2718/convert-changetype-infinity

Expected behavior

On all supported OSes and on all versions of .NET:

• (float)Convert.ChangeType("∞", typeof(float)) should equal Single.PositiveInfinity
• (float)Convert.ChangeType("-∞", typeof(float)) should equal Single.NegativeInfinity
• (double)Convert.ChangeType("∞", typeof(double)) should equal Double.PositiveInfinity
• (double)Convert.ChangeType("-∞", typeof(double)) should equal Double.NegativeInfinity

Actual behavior

They all throw on Linux.

Regression?

This has never worked in the past few major versions of .NET (Core). Didn't test EOL'd version of .NET (Core).

Known Workarounds

Special-case "∞" and "-∞"

Configuration

• .NET version: 6, 7, 8
• OS version: Ubuntu 22.04

Other information

No response