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

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

current frame
status: entered frame 5
peg: (lenprefix (backref :tag) 1)
text: 3abc
index: 1

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