working:

codepoint histogram looks like
JSON encoded repesentation of the object
"{'\u1234': 5, ...}"

codepoint signature looks like
"\u1234 \u1234 \u2345 ..."

codepoint catslog looks like
"\u1234 \u1234, \u2345 \u2345 \u2345, ..."

block histogram looks
JSON encoded
"{'Miscellaneous_Mathematical_Symbols_A": 10, ...}"

block signature looks like
"Currency Currency Katakana Currency Katakana ..."

block catalog looks like
"Currency Currency, Katakana Katakana Katakana ..."

category hist looks like
JSON encoded
"{'Letter_Other': 2, 'Symbol_currency':2 ...}"

category signature looks like
"Symbol_currency Symbol_currency Letter_other Symbol_currency
Letter_other..."

category catalog looks like
"Symbol_currency Symbol_currency, Letter_other Letter_other
Letter_other, ..."
improve docu to match the code