QRCodeEx.SpecTable.ec_codewords_per_block

You're seeing just the function ec_codewords_per_block, go back to QRCodeEx.SpecTable module for more information.
Link to this function

ec_codewords_per_block(version, error_correction_level)

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Specs

ec_codewords_per_block(version(), error_correction_level()) :: non_neg_integer()