[dotNetRDF-bugs] incorrect usage of Single.NaN and Double.NaN constants in numeric comparisons

[Rassokhin, D. [JRDUS] <DRA...@it...>]

For example, this type of error is encountered at line 102 in NumericNode.cs (version 1.04 stable):

return this.AsFloat() != 0.0f && this.AsFloat() != Single.NaN;

The second part of the expression, this.AsFloat() != Single.NaN, will always return true, even when this.AsFloat() returns the Single.NaN.
NaN does not equal to any floating-point number, including self. Use !Single.IsNan(this.AsFloat()) instead.

I have found errors of this type in several other places throughout the source code. Please search for all usages of double.NaN, float.NaN, Double.NaN and Single.NaN.

Regards,
Dmitrii Rassokhin.