Describe Float64 conversion explicitly

Author: MilesCranmer

src/units.jl

@@ -123,8 +123,8 @@ const bar = 100 * kPa
     uparse(s::AbstractString)
 
 Parse a string containing an expression of units and return the
-corresponding `Quantity` object. For example, `uparse("m/s")`
-would be parsed to `Quantity(1.0, length=1, time=-1)`.
+corresponding `Quantity` object with `Float64` value. For example,
+`uparse("m/s")` would be parsed to `Quantity(1.0, length=1, time=-1)`.
 """
 function uparse(s::AbstractString)
     return as_quantity(eval(Meta.parse(s)))::Quantity{DEFAULT_VALUE_TYPE,DEFAULT_DIM_TYPE}
@@ -138,8 +138,8 @@ as_quantity(x) = error("Unexpected type evaluated: $(typeof(x))")
     u"[unit expression]"
 
 Parse a string containing an expression of units and return the
-corresponding `Quantity` object. For example, `u"km/s^2"`
-would be parsed to `Quantity(1000.0, length=1, time=-2)`.
+corresponding `Quantity` object with `Float64` value. For example,
+`u"km/s^2"` would be parsed to `Quantity(1000.0, length=1, time=-2)`.
 """
 macro u_str(s)
     return esc(uparse(s))