request for feedback - read-only GUC variables, pg_settings changes

We (mostly Bruce, Tom, Peter, and I) have been having a discussion on 
the PATCHES list regarding some new functionality related to read-only 
GUC variables. The net result is pasted at the bottom of this post. Here 
is a link to the discussion:
http://archives.postgresql.org/pgsql-patches/2003-11/msg00363.php

In short, 5 new read-only GUC variables are created allowing the value 
of certain compile-time settings to be queried. Also the pg_settings 
system view has been expanded to include category, short_desc, and 
extra_desc (corresponding to group, short_desc, and long_desc in the 
generic guc structure). The 5 GUC variables are:

block_size - int  Shows size of a disk block
integer_datetimes - bool  Datetimes are integer based
max_function_args - int  Shows the maximum number of function arguments
max_identifier_length - int  Shows the maximum identifier length
max_index_keys - int  Shows the maximum number of index keys

The main open question at this point is the name for the "block_size" 
variable. Peter favors "block_size", Bruce favors "page_size", Tom 
hasn't taken a position on that specific issue. Does anyone have and 
opinion on the variable name, or any general comments before I commit this?

Thanks,

Joe


regression=# select * from pg_settings where category like 'Compile%';
-[ RECORD 1 ]----------------------------------------------
name       | block_size
setting    | 8192
category   | Compiled-in Options
short_desc | Shows size of a disk block
extra_desc |
context    | internal
vartype    | integer
source     | default
min_val    | 8192
max_val    | 8192
-[ RECORD 2 ]----------------------------------------------
name       | integer_datetimes
setting    | on
category   | Compiled-in Options
short_desc | Datetimes are integer based
extra_desc |
context    | internal
vartype    | bool
source     | default
min_val    |
max_val    |
-[ RECORD 3 ]----------------------------------------------
name       | max_function_args
setting    | 32
category   | Compiled-in Options
short_desc | Shows the maximum number of function arguments
extra_desc |
context    | internal
vartype    | integer
source     | default
min_val    | 32
max_val    | 32
-[ RECORD 4 ]----------------------------------------------
name       | max_identifier_length
setting    | 63
category   | Compiled-in Options
short_desc | Shows the maximum identifier length
extra_desc |
context    | internal
vartype    | integer
source     | default
min_val    | 63
max_val    | 63
-[ RECORD 5 ]----------------------------------------------
name       | max_index_keys
setting    | 32
category   | Compiled-in Options
short_desc | Shows the maximum number of index keys
extra_desc |
context    | internal
vartype    | integer
source     | default
min_val    | 32
max_val    | 32