[Yaml-core] The implicit-key production (or how time is quoted in keys)

[Clark C . E. <cc...@cl...>]

> | > I really don't see a need for implicits beyond 
> | > string, int and real.  Use the long form otherwise.
> | 
> | I think allowing for dates, IP addresses, and 
> | other *scalar* types is very useful.
> | 
> | I agree with you that ^<alpha> should be an implicit !str regexp.

I'd like !date and !time at the minimum, 
!currency would also be a nice implicit.

I these three scalar types are found more
often in my data than floats.  They are
"core" data types to me.

> Well, if time, ip and currency *were* implicits then
> we could just do:
> 
> lunch: 14:30
> ip: 192.168.2.1
> price: $10.5
>
> I don't see what this argument has to do with
> Inline Collections

Correct.  This doesn't have anything to do
with inline collections.  However, it is
a slight indicator/production complexity
which must be managed carefully.

When time 10:30 is used as a key, it must
be escaped.   So, if we want it to be 
unquoted as a value, we need yet-another
scalar type... (7 of them), this seventh
is the "implicit-key".   That said, I think
we need the implicit-key anyway to restrict
the keys from containing new lines.

Best,

Clark