Unions not supported in map indexes (version 1.4.1.0)

[jice-nospam]

This syntax :
var map: { [index: string|number ]: number };

results in compiler error :
An index signature parameter type must be 'string' or 'number'.

[ahejlsberg]

This is by design. It is already the case that a string index signature defines a constraint for all properties in a type and allows index expressions of type string, number, or any, so you can get the effect above simply by defining:

var map: { [index: string]: number };