Changed the postincrement operator to a preincrement operator in the for loops in src/consensus/merkle.cpp and src/consensus/tx_verify.cpp.
The compiler might actually optimize the for loop process in either case, but like the Developer Notes say: ++i is preferred over i++.
NACK.
While preincrement in general is preferable over postincrement, there is no practical different when we're talking about integer types. Every compiler created the past 10 years will produce identical code for both. Changes to consensus code need more justification than this.
Thank you for the quick input!