How to see integer representation of a list of characters

Questions & Help Questions
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4

'0' here is not 0, but 48, which is printable.

iex(test@127.0.0.1)> [0]
[0]
iex(test@127.0.0.1)> [?0]
'0'
iex(test@127.0.0.1)> [48]
'0'
iex(test@127.0.0.1)> ?0
48