title: Formatting markdown table with numeric and integer columns
body: <p>How can knitr::kable() ignore to format an integer column and format all the ohter numeric columns?</p>
  
  <p>Example: </p>
  
  <p><code>knitr::kable(x = as.data.frame(rbind(c(1L, 21.211), c(2L, 31.233))), format.args = list("digits" = 2, "nsmall" = 2, "big.mark" = ".", "decimal.mark" = ",", "scientific" = FALSE))</code></p>
  
  <p>It returns:</p>
  
  <p><code>[1] "|   V1|    V2|" "|----:|-----:|" "| 1,00| 21,21|" "| 2,00| 31,23|"</code> </p>
  
  <p>And I what an output like this: </p>
  
  <p><code>[1] "|   V1|    V2|" "|----:|-----:|" "| 1| 21,21|" "| 2| 31,23|"</code> </p>
  
  <p>Thanks</p>