mysql-test/r/insert.result:
  Fixed the test cases.
mysql-test/t/cast.test:
  We need to do replace_result because warnings are printed by another procedure.
mysql-test/t/insert.test:
  Windows implements a different rounding rules in printf("%g"), thus we still need to do replace_result.
sql/field.cc:
  Limit the precision to avoid garbage past the significant digits.