import { BigNum } from "https://deno.land/x/lucid@0.5.2/src/core/wasm_modules/cardano-multiplatform-lib-web/cardano_multiplatform_lib.js";
returns 0 if it would otherwise underflow
x/lucid/src/core/wasm_modules/cardano-multiplatform-lib-web/cardano_multiplatform_lib.js>BigNum#clamped_sub
import { BigNum } from "https://deno.land/x/lucid@0.5.2/src/core/wasm_modules/cardano-multiplatform-lib-web/cardano_multiplatform_lib.js";
returns 0 if it would otherwise underflow