I'd like to raise an issue with ES7 value objects with maps raised here: http://esdiscuss.org/topic/maps-with-object-keys
To save you all time, let me sum things up: ES6 maps don't solve a particular (but common) issue for me - using compound objects as keys. I do a lot of statistical analysis and I need keys to be compound tuples or other values. This is currently not possible with ES6 since map key equality is checked with `===` so it is always reference equality ES7 introduces value objects - which are really cool anyway. This allows for compound keys.which partially solves my issue because value keys are compared structurally with `===`. However, it does not let me index on partial information (described in my last commend on that issues). Since it is impossible to override `===` in value objects from what I understand - It would be impossible for me to use partial objects as keys. To illustrate, if for example I have a lot of 10 dim vectors, and I want to index them as keys based on their first two dimensions - it is impossible at the moment and I have to project them into their 2d counterparts which have no further use for me. Is this somehow addressed? I'm unsure where to look for answers. It seems natural to me to allow specifying a hashing function in the `Map` constructor (rather than on every type) to solve this particular (but again, rather common in code that does crunching) problem. Thanks, Benjamin
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