cell.js
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	const t = require('typical')

	const _value = new WeakMap()
	const _column = new WeakMap()

	class Cell {
	constructor (value, column) {
	this.value = value
	_column.set(this, column)
	}

	set value (val) {
	_value.set(this, val)
	}

	get value () {
	let cellValue = _value.get(this)
	if (typeof cellValue === 'function') cellValue = cellValue.call(_column.get(this))
	if (cellValue === undefined) {
	cellValue = ''
	} else {
	cellValue = String(cellValue)
	}
	return cellValue
	}
	}

	module.exports = Cell