refactor: remove leftover from read_initializer feature
#2949
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While auditing the use of unsafe, I've discovered a strange way of growing and initialising the extended part of a
Vec, which resulted in aVec::set_lencall that technically violates the safety invariants - the new length isn't fully init yet, and also uses unsafe operations and aread_initializerstyle API for something so simple.This replaces it with a much simpler implementation.