elves / elvish / 2419

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Basic support for float64 as an Elvish type. This addresses #816.

Float64 values are printed like (float64 42). However, the float64
builtin does not actually exist yet, and builtin math functions do not
accept float64 arguments either.

However, after this CL, from-json | to-json is now an identity operator.
Previously:

~> echo '[1]' | from-json | to-json
["1"]

Now:

~> echo '[1]' | from-json | to-json
[1]

It is also possible to use from-json to construct float64 values before
the float64 builtin is actually implemented.

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