- use the same type (int) for zval.value.usr.len and zval.value.str.len
- use union "zstr" as char*/UChar* mixture instead of void*
- Z_UNISTR() and Z_UNILEN() no longer check for Z_TYPE()
- nuke int32_t from ZE (not finisned)
Now IS_BINRAY data type is removed and IS_STRING starts behave as IS_BINARY in unicode mode. IS_STRING is incompatible with IS_UNICODE, so ALL functions should be improved to support unicode mode.