How to fix Multidimensional arrays must have sub-arrays with matching dimensions in PostgreSQL

INSERT INTO table_name (array_col) VALUES ('{{a, b}, {c}}');
-- ERROR: First sub-array has 2 elements, second has 1

INSERT INTO table_name (array_col) VALUES ('{{a, b}, {c, d}}');
-- Both sub-arrays have 2 elements

INSERT INTO table_name (array_col) VALUES
  ('{{1, 2}, {3, 4}}'),  -- 2x2 array
  ('{{5, 6}, {7, 8}}'),  -- 2x2 array - MATCHES
  ('{{9, 10}, {11}}');   -- ERROR: Second row is ragged

-- Invalid (ragged):
INSERT INTO meetings (schedule) VALUES ('{{meeting, lunch}, {meeting}}');

-- Valid (padded with NULL):
INSERT INTO meetings (schedule) VALUES ('{{meeting, lunch}, {meeting, NULL}}');

-- Define a domain for a single activity record
CREATE DOMAIN activity_record AS TEXT[];

-- Create a table with an array of variable-length activity records
CREATE TABLE schedule (
  id SERIAL PRIMARY KEY,
  activities activity_record[]  -- Array of variable-length arrays
);

INSERT INTO schedule (activities) VALUES
  (ARRAY[ARRAY['meeting', 'lunch'], ARRAY['meeting']]::activity_record[]);

// Example validation function
function validateMultidimensionalArray(arr) {
  if (!Array.isArray(arr) || arr.length === 0) return true;
  
  if (Array.isArray(arr[0])) {
    const firstLen = arr[0].length;
    return arr.every(subArr => 
      Array.isArray(subArr) && subArr.length === firstLen
    );
  }
  return true;
}

const data = [[1, 2], [3, 4]];  // Valid
const badData = [[1, 2], [3]];   // Invalid

if (!validateMultidimensionalArray(badData)) {
  throw new Error('Array dimensions do not match');
}