Fixed bugs;

• (write '\x7c;) wrote | instead of |\||. #19
• Reading #!r6rs from string changed writer's behaviour. #20
• Passing negative value to hashtable constructor procedure caused C level assert. #21
• pointer->integer didn't consider the result values bit length. #22
• Passing big exponent to expt returned incorrect value. #23
• (expt 1.0 0) returned exact number. #25
• sash didn't accept non ASCII options. #26
• Passing overflowed value to bytevector input-port with set-port-position! causes SEGV. #27
• Passing overflowed value to bytevector output-port with set-port-position! didn't expand buffer. #28
• randome-source-pseudo-randomize! raised an error. #29

Improvements;

• Bignum multiplication now uses karatsuba algorithm if the given valus is big enough.
• pointer->integer now accepts optional argument bit to specify retrieving value of bits.
• file-options now accepts append option to open append mode.
• set-port-position! now accepts whence optional argument.
• promise? procedure now compromise R7RS tests.

New Features;

• pointer->uinteger has been added to (sagittarius ffi)
• SFTP library (rfc sftp) has been added.