for (i in 1:5) inc_default(i, 5)
cat("\n")
for (i in 1:100) inc_default(i, 100)
cat("\n")
for (i in 1:1000) inc_default(i, 1000)
cat("\n")
for (i in 1:1000) inc_default(i, 1000, steps = 10)
cat("\n")
for (i in 1:10) inc_default()
cat("\n")
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