[TYPO3-core] RFC: #10861: Eval of double2 doesn't work

[Steffen Kamper]

Hi,

after a conspirative session with Bernhard :-) we found the check is not 
enough. Wrong entry ends up in NaN which should not happen at any time.

So i rewrote both methods of eval and tested with any possible input 
(also nonsense), result is attached version 2.
Maybe it looks complicate, and indeed it is: Removing not valid chars, 
checking for negative, splitting a.s.o. But this way each entry is 
eval'ed to a double and not to 0.00 if illegal chars are found.

vg Steffen
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