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Mike Pall wrote:

Floats are only needed to interface to existing C code or when you
desperately need to save space (i.e. hundreds of megabytes)

Yes, I used float here because I needed to interface to existing C++ 
code ^^.
(I can change c++ code's type to double, but that's another open source 
project and they use float in it and I think it's OK because it's a 
cross platform lib from mobile to PC)

Thanks for the quick fixing!

Zhu Ya Dong