`{key: val}` does look nice indeed, but then it takes more effort to replace e.g. `dict` with `Mapping`. Everything would look much nicer with Haskell-like synt

`{key: val}` does look nice indeed, but then it takes more effort to replace e.g. `dict` with `Mapping`. Everything would look much nicer with Haskell-like syntax: `dict key val` or `list val`. Or maybe even prefer `{} key val` and `[] val` (no that doesn't look good, I agree).