(function to check which chars belong to which token) takes a vector of xs to check if these lie between pairs of ys and if so returning their index; assumes xs and ys are sorted; returns only the first span index which enclosing the x

1 | ```
which_token_worker(x, y1, y2)
``` |

`x` |
a vector of type numeric; a number to be placed into a span |

`y1` |
a vector of type numeric; first element of span |

`y2` |
a vector of type numeric; last element of span |

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