fix two tests reading one byte too much

fix putc tests to make more sense of the bitwise or

fix obsolete documentation

improve hash key handling

#189 #199 implement and test map rehash

#199 test removing via iterator

fix wrong slot and index numbers

corrects documentation of iterator behavior

(0) -300 -100 -30 -10 -8 +8 +10 +30 +100 +300 tip

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