Proposal of a better hash table implementation based on SRFI 125

["Jéssica Milaré" <jessymilare@gmail.com>]

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Hello,

As I said in a previous e-mail, currently SRFI-69 is broken for weak hash
tables - and I've sent a patch to fix it. However, I think there are many
other problems with current implementation of hash tables. There are guile
standard hash tables, SRFI-69 hash tables (which is implemented on top of
standard hash tables) and also R6RS hash tables (which is implemented on
top or SRFI-69 and completely lacks support for weak keys and/or values).

I think that should be fixed and guile should have only two kinds of hash
tables: the standard guile hash table and another extended hash table type
that will be used directly by R6RS, SRFI-125 and SRFI-69. In my opinion, it
should be based on SRFI-125, which is part of R7RS Red Edition, but also
supports some other procedures to make it compatible with R6RS and SRFI-69,
supporting weakness and immutable hash tables.

I'm already implementing the SRFI-125 based hash tables library for myself,
so, if that is accepted, I can also make a patch for guile.

Regards,
Jessica

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