/blockchain/parameters: JSON may return strings instead of numbers
For example:
{
currency: "grains",
c: "0.0001",
dt: "600",
ud0: "1",
sigDelay: "604800",
sigValidity: "2629800",
sigQty: "1",
sigWoT: "1",
msValidity: 2629800,
stepMax: 3,
medianTimeBlocks: 11,
avgGenTime: 600,
dtDiffEval: 20,
blocksRot: 144,
percentRot: 0.67
}