Safari Javascript Objects With Numeric Keys

While working on my Vue.js project, I discovered that objects in Safari behaved differently than Chrome and Firefox.

My server would return an object that looked like this:

"data": {
    "2000":-0.091,
    "2001":-0.1189,
    "2002":-0.221,
    "2003":0.2868,
    "2004":0.1088,
    "2005":0.0491,
    "2006":0.1579,
    "2007":0.0549,
    "2008":-0.37,
    "2009":0.2646,
    "2010":0.1506,
    "2011":0.0211,
    "2012":0.16,
    "2013":0.3239,
    "2015":0.012,
    "2014":0.1369,
    "2016":0.1196
}

The problem begins when Safari decides to add additional keys starting from 0. My data object would be keyed from 0 to 2016, ONLY ON SAFARI. So a calculation like the average of the data gets divided by 2017 rather than 17. Or when I am trying to loop through, null values are read from 0 to 1999.

For my use case, rather than relying on for (var i in data), my solution was to specifically read the data of the years 2000 to the current year (minus one).