parseInt does not work with 0 in mixed string

[henrythasler]

Action

Execute the following code:

const res = parseInt("0 meters", 10);

see also example in Online-Editor

Expected Behavior

res is 0

Observed Behavior

res is NaN

The false behavior is tied to the number being a 0 ("1 meter" works) and thus I suspect that the requirement

If radix is undefined or 0, it is assumed to be 10 except when the number begins with the code unit pairs 0x or 0X, in which case a radix of 16 is assumed.

is not implemented correctly.

References

• Number.parseInt() at MDN