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Fixing dispatch

A fun thing about refactoring code is that after one refactor is finished, the next candidate is easier to see.

In An abstraction gone wrong, we refactored the state variable of a simple tokenizer from an integer into an object. Now that that's done, another problem is staring at us in the face. It's in this code:

if (state == INITIAL) {
    // ...
} else if (state == IN_NUMBER) {
    // ...
} else if (state == IN_STRING) {
    // ...
} else if (state == AFTER_STRING) {
    // ...
} else if (state == ESCAPING) {
    // ...
}
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