Wrong default value for foreign_key_checks variable

select @@foreign_key_checks;

set foreign_key_checks= default;

select @@foreign_key_checks;

select @@foreign_key_checks;

@@foreign_key_checks

1

set foreign_key_checks= default;

select @@foreign_key_checks;

@@foreign_key_checks

0

++

1852      void session_save_default(THD *thd, set_var *var)

1853      { var->save_result.ulonglong_value= global_var(ulonglong) & bitmask; }

++

1809    class Sys_var_bit: public Sys_var_typelib

1810    {

1811      ulonglong bitmask;

1812      bool reverse_semantics;

1813      void set(uchar *ptr, ulonglong value)

1814      {

1815        if ((value != 0) ^ reverse_semantics)

1816          (*(ulonglong *)ptr)|= bitmask;

1817        else

1818          (*(ulonglong *)ptr)&= ~bitmask;

1819      }