===== script =====
print (join "," [])
print (join "," ['foo])
print (join "," ['foo 'bar])
print (join "," ['foo 'bar 'baz])
print (join "," ['foo 1 true [] [->]])

print (join ":::" [])
print (join ":::" ['foo])
print (join ":::" ['foo 'bar])
print (join ":::" ['foo 'bar 'baz])
print (join ":::" ['foo 1 true [] [->]])

print (join 1 [])
print (join 1 ['foo])
print (join 1 ['foo 'bar])
print (join 1 ['foo 'bar 'baz])
print (join 1 ['foo 1 true [] [->]])

foo = [1 2 3]
bar = 0
print (join bar foo)
dump foo
dump bar

===== output =====

foo
foo,bar
foo,bar,baz
foo,1,true,[],[->]

foo
foo:::bar
foo:::bar:::baz
foo:::1:::true:::[]:::[->]

foo
foo1bar
foo1bar1baz
foo111true1[]1[->]
10203
[
  1
  2
  3
]
0