Bug Watch: sliderInput displays wrong value. Problem seems to occur for large values (k but not n). Not tested extensively. Bug reported. # ui.R sliderInput("k", "k:", value = 1000, min = 2, max = 10000) # server.R paste0("input$k = ",input$k) result: input$k = 1002 on start or refresh, instead of the assigned 1000.

server.R

library("shiny")

shinyServer(
  function(input, output, session) {
  
    output$text_n <- renderText({
        paste0("input$n =   ",input$n)
    })
    
    output$text_k <- renderText({
        paste0("input$k =   ",input$k)
    })
    
})

ui.R

# ui.R

library("shiny")

shinyUI(
  pageWithSidebar(
    headerPanel(h3("Debug sliderInput"))
    ,
    sidebarPanel(
      sliderInput("n", "n:", value = 100, min = 2, max = 1000)
      ,
      sliderInput("k", "k:", value = 1000, min = 2, max = 10000)
    )
    ,
    mainPanel(
      textOutput("text_n")
      , textOutput("text_k")
    )
  )
)

Issue reported here:

rstudio/shiny#365