Fix case of Double.NaN

[SandorDobos]

Description.

• Fix case of Double.NaN
• Added more test cases.

Motivation and Context

• Fixes NFUnitTestSystemLib.Number_ToString_Test test fails Home#714.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[networkfusion]

I am guessing that the checks should be against float as well, since we dont use double out of the box?

[SandorDobos]

I am guessing that the checks should be against float as well, since we dont use double out of the box?

The bug on floats leaded to Double class.

[josesimoes]

Nice!

[josesimoes]

I am guessing that the checks should be against float as well, since we dont use double out of the box?

The double type it's always there and exists as a CLR type. What we have optional support for are the math operation with doubles being emulated or using hardware floating point.