Factor out code part for instanceof, and hardwire "is bool" check.

Factor out code part for instanceof, and hardwire "is bool" check.
Committed: https://code.google.com/p/dart/source/detail?r=1770

[regis, 2011-11-21 22:02:35]

LGTM

However, I do not find the factorized code easier to read. On the contrary, I
need to look at one more helper function to understand what happens.

Also, "factorization" is questionable here, since you add 38 lines to remove 11.

[srdjan, 2011-11-22 00:25:29]

Could you please have another look (+13 ,-15 lines, while adding a test).
 
On 2011/11/21 22:02:35, regis wrote:
> LGTM
> 
> However, I do not find the factorized code easier to read. On the contrary, I
> need to look at one more helper function to understand what happens.
> 
> Also, "factorization" is questionable here, since you add 38 lines to remove
11.

[regis, 2011-11-22 00:37:43]

LGTM

Nice!

[srdjan, 2011-11-22 01:36:54]

On 2011/11/22 00:37:43, regis wrote:
> LGTM
> 
> Nice!

Thanks for complaining about the original change :-).