Forward: GLIST_LENGTH(16)
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Backward: GLIST_LENGTH(10)
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Truncate: GLIST_LENGTH(3)
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Concat: GLIST_LENGTH(26)
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Difference: GLIST_LENGTH(8)
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Union: GLIST_LENGTH(18)
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Intersect: GLIST_LENGTH(8)
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Sort: GLIST_LENGTH(10)
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Sort + Uniq + Concat: GLIST_LENGTH(18)
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Find: :10:
Insert: GLIST_LENGTH(11)
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	5	|11|
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Delete :10:: GLIST_LENGTH(10)
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Get #5: :8:
Backward scan:
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Shift:
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	|11|
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Pop:
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