* all internal use of sprintf, snprintf and the like will always
    use the . as thousands seperator (if php.h is included only!).
  * echo, printf() and sprintf() always render locale-aware
  * added the %F modifier for non-locale aware rendering for floats

# Still missing formats (%a, %A)
# Still missing modifier (l) in (%lc, %ls)
# Still missing modifier (L) in (%La, %LA, %Le, %LE, %Lf, %LF, %Lg, %LG)
# C99 requires any conversion to be able to produce at least 4095
# characters. Implementation only allows less then 512.
#
# Only inside ext/mbstring etc. we could use %lc and %ls. And none of the
# rest should affect us until we stay with double and avoid long double.

- Add 'z' prefix.
# Now you can use '%zd' in [v]spprintf() and everything that utilizes it
# like error messages BUT you still cannot rely on it in [v]s[n]printf()
# calls.