`DEFAULT_VALUES` access is a bit slower, avoiding that makes about 45%
faster query methods.

https://gist.github.com/kamipo/e64439f7a206e1c5b5c69d92d982828e

Before (ff299f17):

```
Warming up --------------------------------------
        #limit_value   263.800k i/100ms
    #limit_value = 1   241.758k i/100ms
Calculating -------------------------------------
        #limit_value      7.044M (± 1.5%) i/s -     35.349M in   5.019511s
    #limit_value = 1      6.044M (± 2.3%) i/s -     30.220M in   5.003292s
```

After (this change):

```
Warming up --------------------------------------
        #limit_value   246.295k i/100ms
    #limit_value = 1   244.398k i/100ms
Calculating -------------------------------------
        #limit_value     10.303M (± 2.1%) i/s -     51.722M in   5.022568s
    #limit_value = 1      6.021M (± 6.1%) i/s -     30.061M in   5.015545s
```