0.9.0 --- the keystrokes this console keeps for itself are a position now - #25
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… now openkal 0.14 adds KAL_TERM_PASS_CONTROL, and this implementation reads and writes it as ENABLE_PROCESSED_INPUT, inverted. This environment keeps the keystrokes it reserves --- the interrupt, and the pair that stops and starts output --- behind one flag, where the two termios environments spread the same reservation over three of their own. The position asks one question on either side: does the environment reserve anything at all. That is why it is one position and not one per class of keystroke, which this environment could not answer (clause 6.4). The rule the specification states beside set_mode --- that a position whose requested value is the one in effect is not written --- binds an implementation whose position stands for several mechanisms. Here it stands for one, and assigning it from the mode word is the same act as leaving it alone.
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跟随 openkal 0.14（mcpplibs/openkal#38）：模式字第三个位
KAL_TERM_PASS_CONTROL的读写，以及规范在set_mode旁新增的两条规则。ISIG|IXON|IEXTEN；console:ENABLE_PROCESSED_INPUT），否则同一个模式字在两个系统上含义不同。kal_stream_read会报出一个不是输入结束的 0（条款 7.4）。依赖：openkal 0.14.0。各仓库同名分支
openkal-0.14，CI 会检出同名规范分支。端到端验证（^C以 0x03 到达、^S不冻结、恢复后终端回到原样）在 openkal-musl 的 pty 探针里与宿主 C 库对照。