util.format.number(specifier, value)

Format number value according to the specifier defined via the Python Format Specification Mini-language.

joint.util.format.number('.2f', 5)    // 5.00
joint.util.format.number('03d', 5)    // 005
joint.util.format.number('.1%', .205)    // 20.5%
joint.util.format.number('*^9', 5)    // ****5****