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(meg/match ~(sequence (number :d nil :tag) (capture (lenprefix (backref :tag) 1)))
           "3abc")

captures and tags
captures: @[3 "abc"]
tagged-captures:
  tags: @[:tag nil]
  values: @[3 "abc"]

current frame
status: exiting frame 4 with value: 4
peg: (capture (lenprefix (backref :tag) 1))
text: 3abc
index: 1 advanced to: 4
matched: abc

frames call stack
4 (capture (lenprefix (backref :tag) 1))
0 (sequence (number :d nil :tag) (capture (lenprefix (backref :tag) 1)))