Represent memory usage as f64 as well

Cargo.lock

@@ -515,7 +515,7 @@ dependencies = [
  "num-complex",
  "num-integer",
  "num-iter",
- "num-rational 0.2.4",
+ "num-rational",
  "num-traits",
 ]
 
@@ -572,16 +572,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "num-rational"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
-dependencies = [
- "num-integer",
- "num-traits",
-]
-
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1041,7 +1031,6 @@ version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ffd36e5350a65d112584053ee91843955826bf9e56ec0d1351214e01f6d7cd9c"
 dependencies = [
- "num-rational 0.4.2",
  "num-traits",
  "typenum",
 ]