coerce-df: Coerce and store <data.frame> subclass to <data.frame> and
restore <data.frame> subclass to <data.frame> from attribute.
Description
Coerce and store <data.frame> subclass to <data.frame> and
restore <data.frame> subclass to <data.frame> from attribute.
Usage
.as_df(x).restore_df_subclass(x)
Value
A <data.frame> or subclass of <data.frame>.