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[RFC] Move future extensions section to the end.

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Alessandro Coglio 2021-09-29 10:17:09 -07:00
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docs/rfc/001-initial-strings.md
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@ -345,28 +345,6 @@ We need more analysis to determine which approach is more efficient.
The details of implementing other character and string operations in R1CS
will be fleshed out as each operation is added.
## Future Extensions
As alluded to in the section about design above,
for now, we are avoiding the introduction of a string type,
isomorphic to but separate from character arrays,
because we may want to introduce later a more flexible type of strings,
in particular, one that supports resizing.
This may be realized via a built-in or library circuit type
that includes a character array and a fill index.
This may be a special case of a built-in or library circuit type
for resizable vectors,
possibly realized via an array and a fill index.
This hypothetical type of resizable vectors
may have to be parameterized over the element type,
requiring an extension of the Leo type system
that is much more general than strings.
Because of the above considerations,
it seems premature to design a string type at this time,
provided that the simple initial design described in the section above
suffices to cover the initial use cases that motivate this RFC.
## Drawbacks
This proposal does not appear to bring any real drawbacks,
@ -420,3 +398,25 @@ However, many values of type `field` are not valid Unicode code points,
and many field operations do not make sense for characters.
Thus, having a separate type `char` for characters seems better,
and more in accordance with Leo's strong typing.
## Future Extensions
As alluded to in the section about design above,
for now, we are avoiding the introduction of a string type,
isomorphic to but separate from character arrays,
because we may want to introduce later a more flexible type of strings,
in particular, one that supports resizing.
This may be realized via a built-in or library circuit type
that includes a character array and a fill index.
This may be a special case of a built-in or library circuit type
for resizable vectors,
possibly realized via an array and a fill index.
This hypothetical type of resizable vectors
may have to be parameterized over the element type,
requiring an extension of the Leo type system
that is much more general than strings.
Because of the above considerations,
it seems premature to design a string type at this time,
provided that the simple initial design described in the section above
suffices to cover the initial use cases that motivate this RFC.