Decimal support for math functions

[teofilp]

Hello,
We have integrated the library in our application which uses big decimal numbers and we encountered issues regarding math operations such as Abs and Max but I believe all of them have the same problem. When using these functions with big numbers (at least 20 digits) the result of the operations looses precision. The issue can be observed in this fork: After looking through your documentation I noticed that the math operations are using the built in Math functions from .NET and the documentation provides functions only for double. Is there any way you could integrate decimal math operations? It would be helpful to have this feature built in the library so that we don't have to create custom functions for each math function we need