private boolean parseCaseInsensitiveToken() {
        ws();
        boolean insensitive = peek() == 'i';
        if (insensitive) {
            skip();
            ws();
        }
        return insensitive;
    }
Filter out unnecessary identity selectors when creating the finalized AST to evaluate selectors.
smithy-model/src/main/java/software/amazon/smithy/model/selector/SelectorParser.java