Moving a program to Lua 5.3

[Enrico Colombini <erix@...>]

I am unsure on how to test for correctness when updating a program from 
Lua 5.2 to Lua 5.3. I am worried about the int/fp part (I am not even 
sure I understand all of its implications).

This particular program does many computations and any imprecision, due 
for example to unintended integers where fp values were assumed, could 
go unnoticed if outside the test cases (which were not designed for this 
sort of situation).

Any suggestion on a methodology to look for potential problems 
introduced by the new numeric representation, shorter of re-analyzing 
all of the code from scratch?

[my answer would be that only a line-by-line analysis would do, but I am 
asking anyway...]

--
  Enrico