R Under development (unstable) (2023-11-19 r85561 ucrt) -- "Unsuffered Consequences"
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> library(gtools)
> 
> df1 <- data.frame(a = 1, b = 2, d = TRUE)
> df2 <- data.frame(b = 7, c = "YES", d = FALSE)
> df3 <- data.frame(b = 7, c = "YES")
> 
> smartbind(df1, df2, df3)
   a b     d    c
1  1 2  TRUE <NA>
2 NA 7 FALSE  YES
3 NA 7    NA  YES
> smartbind(df1 = df1, df2, df3 = df3)
     a b     d    c
df1  1 2  TRUE <NA>
2   NA 7 FALSE  YES
df3 NA 7    NA  YES
> 
> proc.time()
   user  system elapsed 
   0.21    0.06    0.26