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

captures and tags
captures: @[]

current frame
status: entered frame 3
peg: (range "09")
text: 3abc
index: 0

frames call stack
3 (range "09")
2 :d
1 (number :d nil :tag)
0 (sequence (number :d nil :tag) (capture (lenprefix (backref :tag) 1)))