The z values within a gtable object can be any numeric values. This function will change them to integers (starting from 1), preserving the original order.

1 | ```
z_normalise(x, i = 1)
``` |

`x` |
A gtable object |

`i` |
The z value to start counting up from (default is 1) |

Ties are handled by the `"first"`

method: the first occurrence
of a value wins.

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