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A CEP that fails is rarely a random number: it is someone who knows the
city and guessed the digits, and the classic guess is the -000 that 957
municipalities never received. The API now answers that 404 with an
optional faixa block naming where the CEP would have been, so a caller
can turn "CEP does not exist" into something the user can act on.
It hangs off the error, never off an address: the lookup still failed.
Parsing gives up quietly at every step — no block, a block that is not
an object, one without a municipality to name — because a broken piece
of context must not turn a clean not-found into a parse failure.
cep_ini and cep_fim are the CEPs that exist, not the range the Correios
publish, and the interval between them is sparse; ceps is what keeps the
pair from being read as a list of valid CEPs.
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