Fixed bugs:

• Modifying string returned from symbol->string shouldn't affect original symbol. (Issue #168)
• Internal process of time-usage converted micro second to second incorrectly.
• Return value of uintptr_t was not handled correctly on 64 bit environment.
• intptr_t and uintptr_t arguments were treated 32 bit integer on 64 bit environment.

New features:

• Bit field for FFI c structure. (Issue #169)
• Following the final SRFI-121.
• Supporting SRFI-127.
• Adding new format specifier ~! which flushes the port.
• More support of SQL on (text sql).
• New style of FFI argument type.
• Null pointer can be passed as callback in FFI.

Improvements:

• SRFI-114 uses builtin symbol comparator.