The stupid question is the question not asked  
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Re^2: Problems with number resolutionby Anonymous Monk 
on Jan 03, 2018 at 14:20 UTC ( #1206601=note: print w/replies, xml )  Need Help?? 
Thanks syphilis for your comment ! I have looked into all suggestions and learned a lot ! Thanks to all ! One question to Math::BigFloat, Math::Decimal and Math::Decimal64 : * Is this correct: As soon as at least one variable in an expression is a Math object (e.g. MEtoD64 after use Math::Decimal64 qw/:all/;) the calculation is done with the Mathfunctions, not with the standard functions. If there is no Math object in the expression, the calculation is still done with the fast standard functions. So I can use both (accurate and fast arithmetic) on the contrary when I use "use bignum", where I always use the accurate Math functions for all operations. * How can I check if a variable is a standard scalar or a Math object (like "ref" for hash/array)? * Is there a good overview document, pointing out the differences between Math::BigFloat, Math::Decimal, Math::Decimal64, Math::BigInt and Math::BigRat. (When to use which library best?)
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