$ perl -MDevel::Peek -le 'my @x = /abc/; Dump(@x)'
SV = PVAV(0x51f85b346e78) at 0x51f85b3c66b8
  REFCNT = 1
  FLAGS = ()
  ARRAY = 0x0
  FILL = -1
  MAX = -1
  FLAGS = (REAL)

$ perl -MDevel::Peek -le 'my @x = scalar(/abc/); Dump(@x)'
SV = PVAV(0x579bb31a2e38) at 0x579bb31c86a8
  REFCNT = 1
  FLAGS = ()
  ARRAY = 0x563bc3d01720
  FILL = 0
  MAX = 3
  FLAGS = (REAL)
  Elt No. 0
  SV = PVNV(0x579bb31a1f40) at 0x579bb31a15a8
    REFCNT = 1
    FLAGS = (IOK,NOK,POK,pIOK,pNOK,pPOK)
    IV = 0
    NV = 0
    PV = 0x579bb31cd6e4 ""\0
    CUR = 0
    LEN = 10