Alexander Volkovsky comments

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                                            Alexander Volkovsky

Remove "both negative and positive value" requirement for XNPV

Removed this requirement in v0.10.6

Improve Numerical Instability in XIRR function

@yugui923, thanks for the detailed description. I definitely want to implement normalization. It could also be helpful in cases with small intervals between dates. I am also thinking about a...

result doesn't match to what's from Excel

@yxl1108, your cash flow is non-conventional (the sign changes more than once), which means the XIRR equation can have multiple solutions. Both results are valid solutions. The result depends on...

Is it possible to extend this package to other language ?

@yellowbean, Yes, it's definitely possible. I've even created a [PR](https://github.com/Anexen/pyxirr/pull/51) for this. If there is a demand for FFI, I will try to merge it as soon as possible. Just...