Internal function. Applies a 'mask' to a table to ensure it has the appropriate column values, in an effort to avoid explosions. How this works is that it rbinds the mask and the dat, with fill = TRUE, then removes the masked row, leaving only the original data, plus whatever columns were missing but expected, behind and with NA
| 1 | apply_mask(mask_names, dat)
 | 
| mask_names | A Vector of mask names to apply | 
| dat | The data set to apply them to. | 
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