\starttext

\unexpanded\def\test#1%
  {\dontleavehmode\hbox{%
   \hbox to 1cm{\char#1\hss}%
    U+\uchexnumber{#1}%
   /D+#1%
   /I+\uchexnumber{\cldcontext{fonts.hashes.characters[true][#1] and fonts.hashes.characters[true][#1].index or 0}}%
   }\par}

\startbuffer[1]
    \test{\number`一}
    \test{\number`㏽}
\stopbuffer
\startbuffer[2]
    \test{\number"301C}
    \test{\number"2016}
    \test{\number"FF5E}
\stopbuffer
\startbuffer[3]
    ⿓ (U+02FD3) 龍 (U+09F8D) 龍 (U+0F9C4)\par
\stopbuffer

\startTEXpage[offset=10pt]
    \definedfont   [file:notosanskr-regular.otf]\getbuffer[1]\blank\getbuffer[3]\blank
    \definedfont[file:notosanscjkkr-regular.otf]\getbuffer[1]\blank\getbuffer[3]\blank
    \definedfont                        [ipaexg]\getbuffer[2]\blank
    \definedfont                        [ipaexm]\getbuffer[2]
\stopTEXpage

\stoptext
