A parameter with its kind and limits. type is number (the default, value a number or an
expression), boolean, choice (value one of options) or text (value taken as it is). A
choice or text value may be { "expr": "..." }, computed from other parameters.
min, max and options are enforced on every value a build uses; unit, step, label,
description and group are for the people and tools that edit it. A number parameter's unit
is the document's length unit, deg, or none for a count or a ratio.
A parameter with its kind and limits.
typeisnumber(the default,valuea number or an expression),boolean,choice(valueone ofoptions) ortext(valuetaken as it is). A choice or text value may be{ "expr": "..." }, computed from other parameters.min,maxandoptionsare enforced on every value a build uses;unit,step,label,descriptionandgroupare for the people and tools that edit it. A number parameter'sunitis the document's length unit,deg, ornonefor a count or a ratio.