Double-bracket assignment on a catt_df object

Intercepts assignment by the pre-1.11.0 Title-Case column names (e.g., df[["Estimated TE"]] <- v) and stops with a migration message pointing to the new snake_case name. This closes the gap where a partial migration (RHS updated to new name, LHS still old) would silently append a new column rather than overwriting the renamed one. All other assignment falls through to the data.frame method via NextMethod().

Usage

# S3 method for class 'catt_df'
x[[i, ...]] <- value

Arguments

x

A catt_df object.

i

Index; passed through to [[<-.data.frame. Character indices matching an old column name are intercepted.

...

Further arguments passed through.

value

The value to assign.

Value

The modified catt_df object, as for [[<-.data.frame.