Map (Xantham)

Map Module

Function or value	Description
`choose fn map` Full Usage: `choose fn map` Parameters: fn : `'Key -> 'Item -> 'Outcome option` map : `Map<'Key, 'Item>` Returns: `Map<'Key, 'Outcome>` Modifiers: inline Type parameters: 'Key, 'Item, 'Outcome (requires comparison)	fn : `'Key -> 'Item -> 'Outcome option` map : `Map<'Key, 'Item>` Returns: `Map<'Key, 'Outcome>`