Headers in Table don't calculate the size correctly if using emoticons like "🧪"

[mastrzyz]

For some reason with the following code :

const baseColumns = [
  ["🧪aaaa", ""],
  ["A", "B"]
];

const config = {
  spanningCells: [{ col: 0, row: 0, colSpan: 2 }]
};

console.log(table(baseColumns, config));

We get the following error from table :
subjectWidth: 6 , containerwidth:5
node_modules/table/dist/src/alignString.js

    if (subjectWidth > containerWidth) {
        throw new Error('Subject parameter value width cannot be greater than the container width.');
    }

This does not repro if I remove the emoticon

const baseColumns = [
  ["aaaaaaaaaaaaaaaaaaaaaa", ""],
  ["A", "B"]
];

const config = {
  spanningCells: [{ col: 0, row: 0, colSpan: 2 }]
};

console.log(table(baseColumns, config));

output.

╔═══════╗
║ aaaaa ║
║ aaaaa ║
║ aaaaa ║
║ aaaaa ║
║ aa    ║
╟───┬───╢
║ A │ B ║
╚═══╧═══╝

Note this also repros if I use colSpan instead of header.