function readField(objects, objectName, fieldName) {
    let group = Object.values(objects).find(s => s.name === objectName);
    if (group) {
        const result = group[fieldName];
        if (result === undefined) {
            throw "readField: field '" + fieldName + "' not found on object named '" + objectName + "' with fields '" + Object.keys(group) + "'";
        } else {
            return result;
        }
    } else {

    )
}

const throwError = (message, Ctor) => {
    throw new Ctor(message)
}

const checkPath = (path, originalPath, doThrow) => {
    if (!isString(path)) {
        return doThrow(
            `path must be a string, but got \`${originalPath}\``,
            TypeError
        )
    }

    // We don't know if we should ignore EMPTY, so throw
    if (!path) {