For array/seq (which known as openArray when used as argument type), we can
define the type easily by explicitly type the first element type like
let int8Arr = [byte 1, 2, 3, 4, 5] // array[0..4, byte]
var int16seq = @[1'i16, 2, 3, 4, 5] // seq[int16]
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But not so with tuple
let cstrarr = [(cstring"one", 1), ("two", 2), ("three", 3)] # will yield
compile error
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So we have no other choice other type manually to convert it, or resort to
proc/template to convert it
proc headers[V](hds: varargs[(string, V)]): (cstring, V) =
result = @[] # newer Nim doesn't have to initialize it anymore
# notice the we add the "tuple", so add space after proc `add`
# ofc we can also write it like result.add((cstring k, v))
# when in doubt which to use, use parenthesis
for k, v in hds: result.add (cstring k, v)
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