Draft specification:

5.1.3.1. Valid values

The value of "minimum" MUST be a JSON number. The value of
"exclusiveMinimum" MUST be a boolean.

If "exclusiveMinimum" is present, "minimum" MUST also be present.

5.1.3.2. Conditions for successful validation

Successful validation depends on the presence and value of
"exclusiveMinimum":

if "exclusiveMinimum" is not present, or has boolean value false,
then the instance is valid if it is greater than, or equal to, the
value of "minimum";

if "exclusiveMinimum" is present and has boolean value true, the
instance is valid if it is strictly greater than the value of
"minimum".

5.1.3.3. Default value

"exclusiveMinimum", if absent, may be considered as being present
with boolean value false.