according to docs, I expected a number. Instead debugger shows:

?data.getNumberOfColumns()
2

data.getNumberOfRows
{...}
    yc: {...}

?data.getNumberOfRows.yc
{...}
    yc: {...}

?data.getNumberOfRows["yc"].toString()
"function(a){gc(this,a)}"

How do I use this to get the row count?
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